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Appendix G — EXAMPLE CALCULATION OF OUTDOOR AIR RATE

California Mechanical Code (Title 24, Part 4) · 2019 edition · updated 2026-09-10 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

(Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

Adopting Agency BSC BSC-
CG
SFM HCD DSA OSHPD BSCC DPH AGR DWR CEC CA SL SLC
Adopting Agency
**BSC ** BSC-
CG
SFM 1 2 1-AC **AC ** SS SS/CC 1 1R 2 3 4 5 5 5 5 5 5 5 5 5
Adopt Entire Chapter


Adopt Entire Chapter as
amended (amended sections
listed below)

Adopt only those sections
that are listed below

Chapter/Section

The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.

2019 CALIFORNIA MECHANICAL CODE 485

486 2019 CALIFORNIA MECHANICAL CODE

APPENDIX G

EXAMPLE CALCULATION OF OUTDOOR AIR RATE

The provisions contained in this appendix are not mandatory unless specifically adopted by a state agency, or referenced in the adopting ordinance.

G 101.0 Example Calculation of Outdoor Air Rate.G 101.1 Example Calculation. Determine the outdoor air rate required for a single zone AC unit serving an interior 2000 square feet (185.81 m 2 ) conference/meeting room with a design occupancy of 100 people. The system supplies and returns air from the ceiling. (See Chapter 4 of this code for guidelines)

Solution: In accordance with Table 403.2.2, the zone air distribution effectiveness is 1.0 since the system supplies cooling only from the ceiling. Using the rates from Table 402.1 for a conference/meeting room, the minimum system outdoor air rate is calculated to be:

RpPz + RaAz

RpPz +

Vot = Ez

5 x 100 + 0.06 x 2000

1.0

(Equation G 101.1)

= 620 cubic feet per minute (ft 3 /min)

Where:

Az = zone floor area: the net occupiable floor area of

the zone in square feet.

Az = zone floor area: the net occupiable floor area of

the zone in square feet. Pz = zone population: The largest number of people

expected to occupy the zone during typical usage.

Pz = zone population: The largest number of people

expected to occupy the zone during typical usage. Where the number of people expected to occupy the zone fluctuates, Pz shall be permitted to be estimated based on averaging approaches described in Section 403.6.1. Where Pz cannot be accurately predicted during design, it shall be estimated based on the zone floor area and the default occupant density in accordance with Table 402.1. Rp = outdoor airflow rate required per person in accor dance with Table 402.1 .

e expected to occupy the zone fluctuates, Pz shall be permitted to be estimated based on averaging approaches described in Section 403.6.1. Where Pz cannot be accurately predicted during design, it shall be estimated based on the zone floor area and the default occupant density in accordance with Table 402.1. Rp = outdoor airflow rate required per person in accor dance with Table 402.1 .

Rp = outdoor airflow rate required per person in accor dance with Table 402.1 . Ra = outdoor airflow rate required per unit area in accor dance with Table 402.1.

Ra = outdoor airflow rate required per unit area in accor dance with Table 402.1. Ez = zone air distribution effectiveness in accordance

with Table 403.2.2.

with Table 403.2.2.

For SI units: 1 square foot = 0.0929 m 2, 1 cubic foot per minute = 0.00047 m 3 /s

2019 CALIFORNIA MECHANICAL CODE 487

any other purpose or distributed to any other persons or parti es.

488 2019 CALIFORNIA MECHANICAL CODE

INDEX

© 2018 International Association of Plumbing and Mechanical Officials. All rights reserved. The copyright in this index is separate and distinct from the copyright in the document that it indexes. The licensing provisions set forth for the document are not applicable to this index. This index may not be reproduced in whole or in part by any means without the express written permission of IAPMO.

– A – ABSORPTION SYSTEM

Cooling system . . . . . . . . . . . . . . . . . . . . . . . Chapter 11 Duct system . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 6 ABSORPTION UNIT

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0 Labeling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307.4 ACCEPTED ENGINEERING

PRACTICE . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0, 309.1 ACCESS PANELS

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0 Ducts connected to

duct furnaces . . . . . . . . . . . . . . . . . . . . . . . . . . 905.3 Exhaust systems,

commercial kitchen . . . . . . . . . . . . . 510.1.5, 510.3.1,

510.3.6, 510.3.6.1, 514.4.8, 514.4.9 ACCESSIBILITY FOR

Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.1 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304.0 ACCESSIBILITY OF

Appliances and equipment . . . . . . . . . . . . . . . . . 304.1,

304.3, 304.4 Appliances and equipment

on roof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304.3 Boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1010.0 Cleanouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 802.5.10 Draft hoods. . . . . . . . . . . . . . . . . . . . . . . . . . . . 802.12.5 Drips, fuel gas piping . . . . . . . . . . . . . . . . . . . . 1310.8.1 Evaporative coolers. . . . . . . . . . . . . . . . . . . . . . . . 933.3 Fire dampers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 605.5 Floor furnace. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 906.8 Fuel gas meters . . . . . . . . . . . . . . . . . 1308.6.1, D 104.2 Fuel gas piping . . . . . . . . . . . . . . . . . . . . . . . 1310.2.2.1 Fuel gas pressure regulators . . . . . . . . . . . . . .1308.7.2,

1310.4.1 Grease filters. . . . . . . . . . . . . . . . . . . . . . . . . . 509.2.3.2 Lapped flanges . . . . . . . . . . . . . . . . . . . . . . 1308.5.10.6 Motors and fans, exhaust systems . . . . . . . . . . . . 503.1 Refrigeration equipment . . . . . . . . . . . . . . . . . . . 1105.3 Smoke dampers . . . . . . . . . . . . . . . . . . . . . . . . . . 605.5 ACCESSIBLE

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0 Easily, definition. . . . . . . . . . . . . . . . . . . . . . . . . . . 207.0 Readily, definition . . . . . . . . . . . . . . . . . . . . . . . . . 203.0

ADMINISTRATION . . . . . . . . . . . . . . . . . . . . . . . . Chapter 1

California . . . . . . . . . . . . . . . . . . . . Chapter 1, Division I General. . . . . . . . . . . . . . . . . . . . . Chapter 1, Division II AIR

Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407.3 Circulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407.4 Classification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403.9 Combustion . . . . . . . . . . . . . . . . . (see Combustion Air)

Dilution. . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0, 701.1,

802.6.3.1, 902.12

Distribution . . . . . . . . . . . . . . . . . . . . . . . . . 414.2, 415.1

Ducts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (see Ducts)

Economizer . . . . . . . . . . . . . . . . . (see Economizer, air)

Filters. . . . . . . . . . . . . . . . . . . . . . . . . . . (see Filters, air)

Furnace . . . . . . . . . . . . . . . . . (see Furnaces, warm air)

Heaters. . . . . . . . . . . . . . . . . . . . . . . . . (see Heater, air)

Makeup . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0, 403.7,

504.1, 504.4.1, 511.3, 517.1.3, 517.6.1, 517.6.2, 701.3, 931.5.4, 1106.7 Moving Systems. . . . . . . . . . . . . . . . . . . . . 203.0, 608.1 Outside . . . . . . . . . . . . . . . . . . . . . . . 203.0, 311.1, 311.3 Pollution control

devices. . . . . . . . . . . . . . . . . . 203.0, 512.3.1, 512.3.2 Recirculation. . . . . . . . . . . . . . . . . 403.7, 403.9, 512.3.2 Relief. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0 Replacement . . . . . . . . . . . . . . . . . . . (see Air, makeup) Return. . . . . . . . . . . . . . . . . . . 203.0, 311.1, 311.3, 311.4 Supply . . . . . . . . . . . . . . 203.0, Chapter 4, 914.5, 915.5 Ventilation. . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 4 AIR CONDITIONED

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0 AIR CONDITIONING

Coils. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 903.2.6 Gas fired type . . . . . . . . . . . . . . . . . . . . . . . . . . . . 903.2 Refrigerant port protection . . . . . . . . . . . . . . . . . 1105.11 System test . . . . . . . . . . . . . . . . . . . . . . . . . . . . E 805.0 System water use . . . . . . . . . . . . . . . . . . . . . . . E 403.0 AIR-HANDLING UNIT

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0 Ducts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 6 System test . . . . . . . . . . . . . . . . . . . . . . . . . . . . E 805.0 AIR, EXHAUST

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0 Openings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305.2.2

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INDEX any other purpose or distributed to any other persons or parti es.

ALARMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416.0, 418.5 ALTERNATE MATERIALS AND METHODS

CONSTRUCTION EQUIVALENCY . . . . . . . . . . . . . . 302.2 ALTERNATIVE ENGINEERING DESIGN

Design approval. . . . . . . . . . . . . . . . . . . . . . . . . 302.3.4

Design document. . . . . . . . . . . . . . . . . . . . . . . . 302.3.3

Design review . . . . . . . . . . . . . . . . . . . . . . . . . . 302.3.5

Inspection and testing . . . . . . . . . . . . . . . . . . . . 302.3.6

Permit application . . . . . . . . . . . . . . . . . . . . . . . 302.3.1

Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . 302.3.2

AMMONIA . . . . . . . . . . . . . . . . . . . . . . . . . . . 1102.1, 1104.4,

1102.2, 1102.3, 1106.2, Table 1102.3 ANCHORAGE OF

Appliances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303.4 Boilers and pressure vessels . . . . . . . . . . . . . . . . 1001.5 Cooling towers. . . . . . . . . . . . . . . . . . . . . . . . . . . 1120.0 Evaporative condensers . . . . . . . . . . . . . . . . . . . 1120.0 Fluid coolers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1120.0 Refrigeration equipment

and piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1105.2 ANODELESS RISER . . . . . . . . . . . . . . . . 203.0, 1308.5.4.2 APPEALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107.0 APPLIANCE FLUE OUTLET

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0 APPLIANCES

Access to . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .304.0 Air filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .936.0 Approval of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .301.2 Clearance . . . . . . . . . . . . . . . .303.3, 303.10, 303.10.1,

Table 303.10.1, Table 802.7.3.3 Closed combustion

solid-fuel-burning, definition . . . . . . . . . . . . . . . 205.0 Clothes dryers . . . . . . . . . . . . . . . . . (see Clothes dryer) Cooking . . . . . . . . . . . . . . . . . . . . . 517.2–517.2.2, 517.7,

517.7.2, 517.8, 517.8.1, 920.0, 921.0, 923.0 Decorative, vented . . . . . . . . . . . . . . 224.0, 911.0, 932.0 Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0 Direct vent. . . . . . . . . . . . . . . . . 206.0, 802.2.6, 802.8.2 Downdraft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 518.0 Electric cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . 307.3 Electric heating. . . . . . . . . . . . . . . . . . . . . . 207.0, 307.2,

903.1, 905.8 Fan-assisted combustion . . . . . . . . . . 203.0, 802.6.2.1,

802.10.2 Floor furnaces . . . . . . . . . (see Furnaces, floor furnace) Food service. . . . . . . . . . . . . . . . . . . . . . . . 918.0, 919.0 Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306.1 Household cooking . . . . . . . . . . . . . . . . . . . . . . . . 920.0 Illuminating . . . . . . . . . . . . . . . . . . 924.0, Table 924.2.1 In attics . . . . . . . . . . . . . . . . . . . . . . . . . . 304.4–304.4.4

In garages . . . . . . . . . . . . . . . . . . 305.1, 305.1.1, 905.7

In manufactured housing . . . . . . . . . . . . . . . . . . . 930.0

In under-floor spaces . . . . . . . . . . . . . . . 304.4–304.4.4

Kilns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 931.0

Labeling of. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307.0

Listed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303.1

Location of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305.0

Low-heat. . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0, 801.2

Medium-heat. . . . . . . . . . . . . . . . . . . . . . . . 203.0, 801.2

Movement of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303.5

Oil-burning . . . . . . . . . . . . . . . . . 301.5, 904.12, 906.13,

907.4, 917.6, 921.3

Open-top broiler units . . . . . . . . . . . . (see Broiler units)

Outdoor cooking . . . . . . . . . . . . . . . . . . . . . . . . . . 923.0

Pit location . . . . . . . . . . . . . . . . . . . . . . . . . . . . .303.13

Protection against

flood damage . . . . . . . . . . . . . . . . . . . . . . . . . . 305.2

Range . . . . . . . . . . . . . . . . . . . . . . . 920.1, 921.1, 921.3

Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 934.0

Refrigerators . . . . . . . . . . . . . . . . . . (see Refrigerators)

Room heaters. . . . . . . . . . . . . . . . . . (see Heater, room)

Solid-fuel burning . . . . . . 902.10, 904.11, 916.3, 1002.4

Unit heaters . . . . . . . . . . . . . . . . . . . . . . . . (see Heater)

Unlisted . . . . . . . . . . . . . . . . . . . . . . . . . . 303.3, 303.10

Venting of . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 8

APPROVED

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0

APPROVED TESTING AGENCY

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0

ATTIC INSTALLATIONS

Appliances . . . . . . . . . . . . . . . . . . . . . . . 304.4–304.4.4

AUTHORITY HAVING JURISDICTION

Authority to disconnect

of gas piping . . . . . . . . . . . . . . . . . . . . . . . . . . 1306.0

Authority to render gas service . . . . . . . . . . . . . . 1305.0

Condemn equipment. . . . . . . . . . . . . . . . . . . . . . . 106.6

Connection approval . . . . . . . . . . . . . . . . . . . . . . . 105.4

Cooperation of other

officials and officers . . . . . . . . . . . . . . . . . . . . . . 103.1

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0

Deputize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103.1

Disconnect utilities in

emergencies, to. . . . . . . . . . . . . . . . . . . . . . . . . 106.5

Inspections . . . . . . . . . . . . . . . . . . . . . . . . 105.0, 1013.0

Issues permits. . . . . . . . . . . . . . . . . . . . . . . . . . . . 104.4

Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103.2

Limitations of authority. . . . . . . . . . . . . . . . . . . . . . 107.2

Powers and duties. . . . . . . . . . . . . . . . . . . . . . . . . 103.0

Right of entry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103.4

Stop orders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106.4

Temporary connection . . . . . . . . . . . . . . . 105.4, 1307.1

Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . 105.3, 302.2.1

AUTOMATIC

CONTROL DEVICES . . . . . . . . . . . . . . . . . . . . . . . . 306.0

AUTOMATIC, BOILERS . . . . . . . . . . . . . . . (see Boiler types,

automatic)

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INDEX

AZEOTROPE

Allowable quantities . . . . . . . . . . . . . . . . . . Table 1102.3 Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0

– B – BAFFLE PLATE . . . . . . . . . . . . . . . . . . . . 204.0, 509.2.2.1,

509.2.2.2, 509.2.2.3 BALANCING, HVAC . . . . . . . . . . . . . . . . . . . 314.0, E 502.3

E 503.6.5.3–E 503.6.5.3.2 BLEED LINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 902.16 BOARD OF APPEALS . . . . . . . . . . . . . . . . . . . . . . . . . 107.0 BOILER

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0 General requirements. . . . . . . . . . . . . . . . . . Chapter 10 In hydronic systems . . . . . . . . . . . . . . . . . . . . . . . 1207.2 Mounting of. . . . . . . . . . . . . . . . . . . . . . 1001.5, 1001.5.1 Operation and maintenance . . . . . . . . . . . . . . . . 1014.0 Room . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0, 1001.2 Venting of. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1001.6 BOILER TYPES

Automatic . . . . . . . . . . . . . . . . . . . . . . . 203.0, 1003.2.1,

Table 1003.2.1 Central heating. . . . . . . . . . . . . . . . . . . . . . 303.2, 904.0 Condensing . . . . . . . . . . . . . . . . . . . . . . . . . . . 1207.2.1 Electric . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1002.3 High-pressure, definition . . . . . . . . . . . . . . . . . . . . 204.0 Low-pressure hot-water-heating,

definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0 Low-pressure steam-heating,

definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0 Miniature Boiler. . . . . . . . . . . . . . . . . . . . . 215.0, 1013.4 Noncondensing. . . . . . . . . . . . . . . . . . . . . . . . . 1207.2.2 Oil burning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1002.2 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . 1010.2, 1013.4 Solid fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1002.4 Steam and hot water . . . . . . . . . . . . . . . . . . . . . . 904.4,

904.5, 904.6, 904.9, 1010.3, 1010.4 BONDING CONDUCTOR

OR JUMPER . . . . . . . . . . . . . . . . . . . . . . . . . . .204.0, 1311.0 BRAZED JOINTS . . . . . . . . . .(see Joints and connections) BREECHING

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0 BRINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1109.9, 1116.5 BROILER UNITS

Open top unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 922.0 BUILDING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204.0 BUILDING CODE

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0 BUILDING OFFICIAL

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0 BUILDING STRUCTURAL MEMBERS . . . . . . 316.9, 902.8 BURNER ASSEMBLIES . . . . . . . . . . . . . . . . . . . . . . . 910.0

BURNER, CONVERSION . . . . . . . . . . . . . . . . . . . . . . 909.1

– C – CARBON MONOZIDE SENSING . . . . . . . . . . . . . . . .403.7.2 CAS NUMBER

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 CENTRAL HEATING PLANT

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 CHIMNEY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .802.5

Cleanouts . . . . . . . . . . . . . . . . . . . .802.5.7.2, 802.5.10 Decorative shrouds . . . . . . . . . . . . .802.5.1.1, 802.5.4.3 Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .205.0 Existing . . . . . . . . . . . . . . . . . . . . . . . .802.5.7, 802.5.7.3 Factory-built . . . . . . . . . . . . . . . . . . . . . . . . . . .802.5.1 Masonry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .802.5.3 Metal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .802.5.2 Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .802.5.5 Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .802.5.9 Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . .802.5.4 CHIMNEY CLASSIFICATIONS

High-heat appliances-type . . . . . . . . . . . . . . . . . . 205.0 Low-heat appliances-type. . . . . . . . . . . . . . . . . . . 205.0 Medium-heat

appliances-type. . . . . . . . . . . . . . . . . . . . . . . . . 205.0 Residential appliances-type . . . . . . . . . . . . . . . . . . 205.0 CHLORINATED POLYVINYL

CHLORIDE (CPVC) PIPE OR TUBING
Ground source loop. . . . . . . . . . . . . . . . . Table E 505.5,
Table E 505.6
Hydronics . . . . . . . . . . . . . . . . . . . 1210.0, Table 1210.1
Joining
and connections . . . . . . (see Joints and connections)
CIRCULATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1208.0
CLASSIFICATION OF CLASSIFICATION OF
Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403.9
Chimney, definition . . . . . . . . . . . . . . . . . . . . . . . . 205.0
Occupancy, definition. . . . . . . . . . . . . . . . . . . . . . . 217.0
Product-conveying ducts. . . . . . . . . . . . . . . . . . . . 505.8
Refrigerants. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1103.1
Refrigeration systems . . . . . . . . . . . . . . . . . . . . . 1103.2

CLEARANCES FOR

Air-conditioning appliances,

gas type . . . . . . . . . . . . . . . . . 903.2.3, Table 904.2.2 Air heaters . . . . . . . . . . . . . . . . . . . . . . . . . 914.4, 915.4 Appliances. . . . . . . . . . . . . . . . 303.3, 303.10, 303.10.1,

304.1, 304.3.1.1, 516.2.1, 701.6.2, Table 303.10.1 Boilers . . . . . . . . . . . . . . . . . . . . . . . . . . 303.2, 904.2.2,

1010.0, Table 904.2.2 Broilers units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 922.3 Clothes dryers, gas type . . . . . . . . . . . . . . . . . . 908.2.1 Connectors. . . . . . . . . . . . . . . 802.10.4, Table 303.10.1,

Table 802.7.3.3 Cooking appliances . . . . . . . . . . . . . . 920.3.1, 920.3.2,

920.4.2, 920.4.3, 923.2 Decorative appliances. . . . . . . . . . . . . . . . . . . . . . 923.2

2019 CALIFORNIA MECHANICAL CODE 491

INDEX any other purpose or distributed to any other persons or parti es.

Draft hoods and controls . . . . . . . . . . . . . . . . . 802.12.6 Ducts, clothes dryer . . . . . . . . . . . . . . . . . . . . 504.4.3.1 Ducts, commercial kitchen

exhaust . . . . . . . . . . . . . . . . . . . . . . . .507.4, 507.4.1,

507.4.6.3, 510.7.3, 510.9.1, 510.9.2 Ducts, furnaces. . . . . . . . . . . . . . . . . . . . . . . . . . . 905.1 Ducts, product conveying,

exhaust. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 506.10, Equipment on roofs . . . . . . . . . . . . . . . . 303.8, 303.8.4,

304.2, 304.3.1.1 Fans, commercial

kitchen exhaust . . . . . . . . . . . . . . . . . . . . . . . . 510.7.3 Floor furnace. . . . . . . . . . . . . . . . . . . . . . . 906.7, 906.11 Food service appliances . . . . . . . . 918.1, 918.2, 919.1,

919.2, 919.3 Furnaces, central heating . . . . . . . . . . 904.2, 904.3.1.2,

Table 904.2.2 Gas-fired toilets. . . . . . . . . . . . . . . . . . . . . . . . . . . 929.1 Gas fireplaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . 912.2 Grease removal devices,

commercial kitchen exhaust. . . . . . . . . . . 507.4, 507.4.1 Hoods . . . . . . . . . . . . . . . . . . . 506.10.2, 507.4, 507.4.1,

507.4.2.3, 507.4.2.1, 507.4.2.3, 931.5.5 Illuminating appliances . . . . . . . . . . . . . . . 924.1, 924.2,

924.2.1, Table 924.2.1 Infrared heaters. . . . . . . . . . . . . . . . . . . . . . . . . . . 926.2 Kilns . . . . . . . . . . . . . . . . . . . . . . . . . . . 931.5.1, 931.5.5 Piping, fuel gas . . . . . . . . . . . . . . . . . . . . . . . . . D 110.1 Piping, hydronics . . . . . . . . . . . . . . . . . . . . . . . . . 1221.6 Pool heaters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 927.2 Prohibited use . . . . . . . . . . . . . . . . . . . . . . 512.1, 701.12 Reduction of . . . . . . . . . . . . . . . . . . . . 506.11, 506.10.4,

506.11.6, 507.4.2, 507.4.2.1, 507.4.2.3, 507.4.3.3 Refrigerators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 928.1 Room heaters. . . . . . . . . . . . . . . . . . . . . . . . . . . 916.2.3 Seepage pans. . . . . . . . . . . . . . . . . . . . . . . . . . . . 906.9 Unit heaters . . . . . . . . . . . . . . . . . . . . . . . 917.2, 917.2.1 Unlisted appliances . . . . . . . . . . . . . . . . . 303.3, 303.10 CLOSE COMBUSTIBLE CONSTRUCTION

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 CLOSET OR ALCOVE INSTALLATIONS

Air conditioners . . . . . . . . . . . . . . . . . . . . . . . . . 903.2.5 Central heating

furnaces and boilers. . . . . . . . . . . . . . . . 303.2, 904.1 Clothes dryers . . . . . . . . . . . . . . . . . . . 504.4.1, 908.2.1 CLOTHES DRYER

Clearance . . . . . . . . . . . . . . . . . . . . . 504.4.3.1, 908.2.1 Commercial use. . . . . . . . . . . . . . . . . . . . . . . . . 504.4.3 Common exhaust. . . . . . . . . . . . . . . . . . . . . . . . 504.4.4 Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 Domestic type. . . . . . . . . . . . . . . . . . . . . 504.4, 504.4.2 Electric type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 908.1

Exhaust duct. . . . . . . . . . . . . 504.4, 504.4.2, 504.4.2.1,

504.4.2.2, 504.4.3 For multiple family use . . . . . . . . . . . . . . . . . . . . 908.2.3 For public use . . . . . . . . . . . . . . . . . . . . . . . . . . 908.2.3 Makeup air. . . . . . . . . . . . . . . . . . . . . . . . 504.4.1, 701.3 Shutoff devices. . . . . . . . . . . . . . . . . . . . . . . . . . 908.2.3 Termination . . . . . . . . . . . . . . . . . . . . . . . 502.2.1, 504.4 Transition ducts. . . . . . . . . . . . . . . . . . . . . . . . 504.4.2.2 Type 1 . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0, 504.4.1,

504.4.2, 908.2.1 Type 2 . . . . . . . . . . . . . . . . . . 205.0, 504.4.3.1, 908.2.1 Unlisted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 908.2.1 CODE

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 COMBUSTIBLE CONSTRUCTION, CLOSED

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 COMBUSTIBLE CONSTRUCTION, OPEN

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217.0 COMBUSTIBLE MATERIAL

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 COMBUSTIBLE MATERIAL, LIMITED

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0 COMBUSTION AIR

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 Duct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 701.11, 701.12 General requirements . . . . . . . . . . . . . . . . . . Chapter 7 COMBUSTION AIR FOR

Boilers, low pressure,

installed in closets . . . . . . . . . . . . . . . . . . . . . . . 904.1 Engineered installations. . . . . . . . . . . . . . . . . . . . . 701.8 Fireplaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 912.3 Fossil fuel heating equipment. . . . . . . . . . . . . E 502.6.1 Furnaces, central heating . . . . . . . . . . . . . . 904.1, 907.3 COMBUSTION AIR FROM

Bedroom or bathroom. . . . . . . . . . . . . . . . . . . . . . 902.2 Chimneys and vents . . . . . . . . . . . . . . . . . . . 802.5.11.1 Combination, indoor and outdoor. . . . . . . 701.7, F 103.0 Indoors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 701.4 Louvers, grilles and screens . . . . . . . . . . . . . . . . 701.10 Mechanical supply . . . . . . . . . . . . . . . . . . . . . . . . . 701.9 Outdoors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 701.6 Refrigeration machinery rooms . . . . . . . . . . . . . . 1106.5 COMMERCIAL FOOD

HEAT-PROCESSING EQUIPMENT

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 COMPRESSOR

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 Flammable gas-air mixture . . . . . . . . . . . . . . 1310.14.1,

1310.14.5 Positive displacement . . . . . . . . . . 205.0, 1111.2, 1112.2, Refrigeration system . . . . . . . . . . . . . . . 1105.2, 1105.3,

1105.6, 1111.2, 1112.2 CONCEALED SPACES

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 Fuel gas piping in . . . . . . . . . . . . . . . . . . . . . . . 1310.3.1

492 2019 CALIFORNIA MECHANICAL CODE

INDEX

Hazardous process piping in . . . . . . . . . . . . . . 1406.2.1 Lighting units in

commercial kitchen hoods . . . . . . . . 512.2.3, 512.2.4 Used as ducts. . . . . . . . . . . . . . . . . . . . . . . . . . . . 602.1 CONDENSATE

Cleanouts for condensate drain . . . . . . . . . . . . . 310.3.1 Control . . . . . . . . . . . . . . . . . . . . . . . . . . 310.2, 1105.10 Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 From air

conditioning equipment . . . . . . . . 310.1, 310.2, 310.5 From air cooling coils . . . . . . . . . . . . . . . . 310.2, 1105.7 From appliances . . . . . . . . . . . . . . . . . . . . . . . . . . 310.4 From category I and

category III appliances . . . . . . . . . . . 802.8.3, 802.9.1 From category II and

category IV appliances . . . . . . . . . . . . 802.8.3, 802.9 From fuel gas piping . . . . . . . . . . . . . . 1310.8, 1310.8.1 From noncategorized

appliances. . . . . . . . . . . . . . . . . . . . . . 802.8.3, 802.9 From refrigeration coils . . . . . . . . . . . . . . . . . . . . . 904.8 Point of discharge . . . . . . . . . . . . . . . . . . . . . . . . . 310.5 Pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310.1.1 Waste pipe sizing . . . . . . . . . . . . . . . 310.3, Table 310.3 CONDENSER

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 CONDENSING APPLIANCE

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 CONDENSING UNIT

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 CONDITIONED SPACE

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 CONFINED SPACE

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 CONFLICT BETWEEN CODES . . . . . . . . . . . . . . . . . 102.1 CONNECTORS

Appliances, category I . . . . . . . . . . . . . . . . . . . . 802.10,

802.10.1–802.10.12.1, Table 802.10.1.3 Appliances, category II, III, and IV . . . . . . . . . . . 802.11 Appliance fuel connector. . . . . . . . . . . . . 203.0, 1312.1,

1312.1.1, 1312.3, 1312.5.2, 1312.5.3 Boilers . . . . . . . . . . . . . . . . . . . . . . . . . . Table 802.7.3.3 Chimney . . . . . . . . . . . . . . . 205.0, 802.5.5, 802.10.1.3,

Table 303.10.1, Table 802.10.1.3 Clearances . . . . . . . . . . . . . . . . . . . . . . Table 303.10.1,

Table 802.7.3.3 Flexible connectors. . . . . . . . . . . . . . . . . . . . . 510.9.1.1,

1312.5.2, 1312.5.3 Gas vent . . . . . . . . . . . . . . . . . 224.0, 802.2, 802.3.3.3,

802.5.5, 802.7.4.1, 802.10—802.10.12.1, 802.11, 803.2–803.2.3, 803.2.11, 803.2.14, 803.2.21 803.2.23, Table 303.10.1, Table 802.7.3.3,

Table 802.10.1.3, Table 803.2.1

Incinerators . . . . . . . . . . . . . . . . . . . . . Table 802.10.1.3 Multiple appliances . . . . . . . . . . . . . . . . . . . . . . . . 803.2 CONSTRUCTION DOCUMENTS

Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 For Permits . . . . . . . . . . . . . . . . . . 1.11.3, 103.3, 104.3.1 CONTAINERS FOR

Grease . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 509.2.4.1 Liquid petroleum gas (LP-Gas) . . . . . . . . . . . . . D 104.3 Oil tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D 113.6.2 Refrigerants . . . . . . . . . . (see Refrigerants, containers) CONTINUOUS ENCLOSURE . . . . . . . . . . . . . . 205.0, 510.7 COOLING

Air system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311.0 Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 904.9 Correctional Treatment Centers . . . . . . . . . 319.1, 319.2 Evaporative cooling system . . . . . . . . . . . . 207.0, 933.0 System, definition . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 Towers . . . . . . . . . . . . . . . . . . . . . . . Chapter 11 (Part II) Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0, 904.9 COPPER OR COPPER

ALLOY PIPE AND TUBING . . . . . . . . . . . . . . . . . . . 1211.3 CORRUGATED STAINLESS STEEL

TUBING (CSST)

Bonding of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1311.2 Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0 Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1310.2.4.1 Test pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1313.3 CREMATORIES

Factory built . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 926.2 CROSS-LINKED POLYETHYLENE (PEX)

PIPING OR TUBING

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.0 Ground source loop . . . . . . . . . . . . . . . . Table E 505.5,

Table E 505.6 Hydronics . . . . . . . . . . . . . . . . . . . 1210.0, Table 1210.1,

Table 1220.2.1 Joining and connections. . . . . . . . . . . . . . . . (see Joints

and connections) Oxygen diffusion . . . . . . . . . . . . . . . . . . . . . . . . . 1210.4 CROSS-LINKED POLYETHYLENE-ALUMINUM- CROSSLINKED POLYETHYLENE (PEX-AL-PEX) PIPING OR TUBING

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.0 Hydronics . . . . . . . . . . . . . . . . . . . 1210.0, Table 1210.1 Joining and connections. . . . . . . . . . . . . . . . (see Joints

and connections)

– D – DAMPERS

Automatically operated. . . . . . . . . . . . . . . . . . . . 802.15,

802.15.1, E 502.10.2 Backdraft. . . . . . . . . . . . . . . . . . . 504.1.1, 504.4, 1106.7 Balancing. . . . . . . . . . . . . . . . . . . . . . . . . . . . .E 502.3.1 Ceiling radiation . . . . . . . . . . . . . . . . . . . . . 205.0, 605.3 Chimney, free opening area . . . . . . . . . . . . . Table 911.2

2019 CALIFORNIA MECHANICAL CODE 493

INDEX any other purpose or distributed to any other persons or parti es.

Combination fire and smoke . . . . . . . . . . . . . . . . . 205.0 Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206.0 Economizers . . . . . . . . . . . . . . . . . . . . . . . . E 503.5.1.1 Fire . . . . . . . . . . . . . . . . . 206.0, 508.3.5.3, 508.3.5.3.1,

511.4.2, 516.2.6, 605.2, 605.5, 933.1 Fire and smoke, access to . . . . . . . . . . . . . . . . . . 605.5 Freedom from interference . . . . . . . . . . . . . . . . . . 605.6 Heating, ventilation,

and air conditioning . . . . . . . . . . . . . . . . . . . E 502.12 HVAC system tests of . . . . . . . . . . . . . . . . . . . . E 805.0 Identification of . . . . . . . . . . . . . . . . . . . . . . . . . . . 605.5 In ducts, commercial

kitchen exhaust . . . . . . . . . . . . . . . . . . 512.1, 512.1.1 In duct furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . 905.6 Manually operated . . . . . . . . . . . . . . 802.13, E 502.10.2 Minimum leakage . . . . . . . . . . . . . . . . . . . E 503.4.6.4.2 Motorized, nonrecirculating

air heating. . . . . . . . . . . . . . . . . . 914.7, E 503.4.6.4.1 Multiple arrangements . . . . . . . . . . . . . . . . . . . . . 605.4 Return air . . . . . . . . . . . . . . . . E 503.5.1.3, E 805.5.1.2,

E 805.5.2, E 805.12.1.1 Smoke . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206.0, 605.1 Supply air . . . . . . . . . . . . . E 503.4.6.4.1, E 503.4.6.4.2 Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1003.4 Vent. . . . . . . . . . . . . . . . . . . . . . . . . . . . 802.13, 802.15,

802.15.1, C 109.1 Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206.0 DECORATIVE

APPLIANCES, VENTED . . . . . . . . . . . . (see Appliances) DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 2 DEPARTMENT

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206.0 DESIGN

Requirements for Ethylene Oxide (ETO)

Sterilization areas . . . . . . . . . . . . . . . . . . . . . 418.0 DESIGN FLOOD ELEVATION . . . . . . . . . . . . . . . . . . . 206.0 DEVICES

Automatic carbon monoxide sensing. . . . . . . . . 403.7.2 Automatic control . . . . . . . . . . . . . . . . . . . . . . . . . 306.0 Detection. . . . . . . . . . . . . . . . . . . . . . . . . 206.0, 514.2.3 Draft control, fuel gas vent . . . . . . . . . . . . . . . . 802.12.2 Grease removal . . . . . . . . . . . . . . 209.0, 507.4, 507.4.1,

509.0, 513.1.1, 514.4.1, 517.5, 517.7.1 Pressure limiting . . . . . . . . . . . . . . . . . . . . 218.0, 904.4,

927.3, 1111.0 Pressure relief . . . . . . . . . . . . . . . . 218.0, 904.6, 1112.0,

1113.0, 1115.4, 1206.1 Quick-disconnect . . . . . . . . . . . . . . . . . 219.0, 1312.3.2,

1312.7 DISTRICT HEATING PLANT

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206.0 DRAFT CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . 802.12 DRAFT HOODS . . . . . . . . . . . . . . . . 206.0, 802.5.5, 802.6.2

DRAINAGE

Boiler rooms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1001.4 Cooling tower . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1121.0 Hydronic piping system . . . . . . . . . . . . . . . . . . . . 1221.4 DRAINAGE PANS . . . . . . . . . . . . . . . . 305.4, 310.2, 1105.7 DUCTLESS MINI-SPLIT SYSTEMS . . . . . . . . . . . . . . 935.0 DUCTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 6

Clothes dryers. . . . . . . . . . . . . . . . . . . . . 504.4, 504.4.2 Combustion air . . . . . . . . . . . . . . 701.6.1, 701.11, 701.12 Combustibles within . . . . . . . . . . . . . . . . . . . . . . . 602.2 Construction of

(product conveying). . . . . . . . . . . . . . . . . . . . . . 506.2 Cross contamination . . . . . . . . . . . . . . . . . . . . . . 603.11 Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206.0 Domestic range vents . . . . . . . . . . . . . . . . . . . . . . 504.3 Duct . . . . . . . . . . . . . . . . 409.0 (OSHPD 1, 1R, 2, 3 & 4) Environmental air . . . . . . . . . . . . . . . . . . . . 207.0, 504.0 Exhaust, commercial kitchen . . . . . . . . . . . . . . . . 510.0 Existing metal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102.2 Factory-made air. . . . . . . . . . . . . . . . . . . . 602.6, 603.4,

603.4.1, 603.8 Fire protection required . . . . . . . . . . . . . . . . . . . . . 506.8 Flexible . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 602.6.1 Flexible air ducts and connectors . . . . . . . . . . . . . 603.5 For kilns . . . . . . . . . . . . . . . . . . . 931.5.3, 931.5.5, 931.6 Furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . 206.0, 905.0 Gravity ventilation. . . . . . . . . . . . . . . . . . . . . . . . 931.5.3 Grease type . . . . . . . . . . . . . . . . . . . . . . . . 209.0, 510.0 Gypsum wallboard . . . . . . . . . . . . . . . . . . . 504.6, 602.5 In under floor or crawl spaces. . . . . . . . . . . . . . . . 603.2 Inspection and cleaning of . . . . . . . . . . . 514.2, 514.4.1 Insulation of . . . . . . . . . . . . . . . . . . . . 604.0, E 502.4.1,

E 503.4.7.1, Table E 503.7.2–Table E 503.7.3(2) Joints and seams . . . . . . . 603.10, 603.10.1, 603.10.1.1 Manifold (common duct) . . . . . . . . . . . . . . . . . . . . 511.4 Material of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 506.1,

510.5.1, 602.0 Metal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 506.1, 602.3,

603.3 Non-grease type. . . . . . . . . . . . . . . . . . . . . 519.4, 519.5 Openings. . . . . . . . . . . . . . . . 510.3, 510.3.3–510.3.3.2,

510.3.4.2, 511.1.5 Other grease . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510.5 Plastic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 603.6 Product-conveying . . . . . . . . . . . . . . . . . 218.0, 502.2.2,

506.0, Table 506.2(1), Table 506.2(2) Protection of. . . . . . . . . . . . . . . . . . . . . . . . 506.9, 603.7 Solid-fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 517.0 Support systems . . . . . . . . . . . . . . . . . . . . . . . .504.4.5,

506.7–506.8.4, 510.1.6, 510.1.7, 510.3.3.3, 510.5.1, 603.3–603.3.2, 603.8 Termination . . . . . . . . . . . . . . . . . . . . . . . . 222.0, 502.2,

510.9, 519.5, 701.11 Underground . . . . . . . . . . . . . . . . . . . . . . 510.8, 603.12

494 2019 CALIFORNIA MECHANICAL CODE

INDEX

        - **E –**

ECONOMIZER, AIR . . . . . . . . . . . . . E 503.5.1, E 503.5.1.2,

Table E 503.5.1.2

ECONOMIZER, WATER . . . . . . . . . . E 503.5.2, E 503.5.2.1,

Table E 503.5.2

ELECTRIC HEATING APPLIANCES

Air conditioners . . . . . . . . . . . . . . . . . . . . . . . . . . . 903.1

Duct heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 905.8

Room heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 916.1

ELECTRICAL CODE

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207.0

ENCLOSED PARKING GARAGES . . . . . . . . . . . . . . . 403.7.2

ENCLOSURE OF DUCTS,

COMMERCIAL KITCHEN EXHAUST

Clearances . . . . . . . . . . . . . . 507.4.6.3, 507.4.8, 510.7.3

Continuous. . . . . . . . . . . . . . . . . . . . . . . . . 205.0, 510.7

Ducts within . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510.7.8

Fire doors required . . . . . . . . . . . . . . . . . . . . . . . 510.7.7

Grease, factory built . . . . . . . . . . . . . . . . 208.0, 507.4.4,

507.4.6, 507.4.6.3

Grease duct, field-applied. . . . . . . . . . . . 208.0, 507.4.5,

507.4.6, 507.4.6.3

Product conveying ducts . . . . . . . . . . . . . . . . . . . . 505.8

ENCLOSURES

For equipment on roof. . . . . . . . . . . . . . . . . . . . . . 303.8

For boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1001.2

ENERGY STAR, DEFINITION . . . . . . . . . . . . . . . . . . E 201.3

ENFORCEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.11.2.1

ENFORCING AGENCY . . . . . . . . . . . . . . . . . . . . 1.11.2, 207.0

ENGINE, GAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1602.0

EQUIPMENT

Clearances . . . . . . . . . . . . . . . . . . . . . 303.10, 303.10.1,

Table 303.10.1

Converted equipment . . . . . . . . . . . . . . . . . . . . . . 902.3

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207.0

Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301.3

Identification of . . . . . . . . . . . . . . . . . . . . . . . . . . . 303.6

Improper location . . . . . . . . . . . . . . . . . . . . . . . . . 308.0

Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303.2

On roofs . . . . . . . . . . . . . . . . . . . . . . . . . . . 303.8, 304.0

Protection against flood damage. . . . . . . . . . . . . . 305.2

Service and access. . . . . . . . . . . . . . . . . . . . . . . . 304.0

ETO STERILIZATION AREAS . . . . . . . . . . . . . . . . . . . . 418.0

EVAPORATIVE

Condenser . . . . . . . . . . . . . . . . . 1119.1, 1120.1, 1123.1

Cooler. . . . . . . . . . . . . . . . . . . . . . 207.0, 933.3, E 403.2

Cooler, portable, definition . . . . . . . . . . . . . . . . . . 218.0

Cooling system . . . . . . . . . . . . . . . . . . . . . . 207.0, 933.0

For health care facilities . . . . . . . . . . . . . . . . . . . . 405.0

EVAPORATOR

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207.0

EXCESS FLOW VALVE . . . . . . . . . . . . . . . . . . . . . . . . 207.0,

1309.0, 1406.2.1.5

EXHAUST

Bathroom exhaust fans. . . . . . . . . . . . . . . . . . . . . 402.5 Clothes dryer . . . . . . . . . . . . . . 504.4, 504.4.2–504.4.5 Commercial kitchen. . . . . . . . . . . . . . Chapter 5 (Part II) Discharge, type I

and type II system . . . . . . . . . . . . . . . . . 519.5, 510.9, Ducts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 504.0, 506.0,

510.0, Chapter 6, 1106.9 Independent system . . . . . . . . . . . . . . . . 504.2, 517.3.1 Mechanical . . . . . . . . . . . . . . . . . . . . . 403.7, Chapter 5,

1105.5.2, 1106.0, Table 403.7 Product conveying . . . . . . . . . . . . . . . . . . . 505.0, 506.0 Refrigeration

machinery room . . . . . . . . . . . . . . . . 1105.5.2, 1106.0 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 418.2 Separation from

other exhaust . . . . . . . . . . . . . . . . . . . . . . . . . 517.3.1 Ventilator openings . . . . . . . . . . . . . . . . . . 311.3, 402.4,

402.4.1, 502.1, 1106.7 EXISTING BUILDINGS . . . . . . . . . . . . . . . . . . . . . . . 302.1.3 EXISTING MECHANICAL SYSTEMS . . . . . . . . . . . . . 102.2 EXPANSION TANKS

Closed-type . . . . . . . . . . . . . . . . . . . . . . 1004.3, 1209.4 Minimum capacity . . . . . . . . . . 1004.4, Table 1004.4(1),

Table 1004.4(2) Open-type . . . . . . . . . . . . . . . . . . . . . . . 1004.2, 1209.3 Where required. . . . . . . . . . . . . . . . . . . . 1004.1, 1209.1

– F –

FAMILY

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208.0 FANS . . . . . . . . . . . . . . . . . . . . . . . . . 503.0, 510.9.1.2, 511.0 FEES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104.5

For investigations . . . . . . . . . . . . . . . . . . . . . . . . 104.5.1 For permits . . . . . . . . . . . . . . . . . . . . 104.5, Table 104.5 For plan review. . . . . . . . . . . . . . . . . . . . . . . . . . 104.3.2 For re-inspection . . . . . . . . . . . . . . . . . . . . . . . . 105.2.6 Mechanical permit fees . . . . . . . . . . . . . . . . Table 104.5 Refunds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104.5.3 FILTERS

Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311.0, 602.2 Correctional Treatment Centers. . . . . . . . . . . . . . . 408.3 Efficiencies . . . . . . . . . . . . . . . . . . . . . . Tables 4-B, 4-C General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 408.1 Grease . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209.0, 509.1 Hospitals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 408.2 In mechanically ventilated buildings . . . . . . . . . . . 401.2 In recirculating systems. . . . . . . . . . . . . . . . . . . . . 516.3 Return air . . . . . . . . . . . . . . . . . . . . . E 603.1.1, E 603.3 FIRE

. . . . . . . . . . . 408.1 Grease . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209.0, 509.1 Hospitals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 408.2 In mechanically ventilated buildings . . . . . . . . . . . 401.2 In recirculating systems. . . . . . . . . . . . . . . . . . . . . 516.3 Return air . . . . . . . . . . . . . . . . . . . . . E 603.1.1, E 603.3 FIRE

Code, definition. . . . . . . . . . . . . . . . . . . . . . . . . . . 208.0 Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . 206.0, 605.0 Doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510.7.7 Extinguishing equipment . . . . . . . . 513.0, 513.13, 517.7

2019 CALIFORNIA MECHANICAL CODE 495

INDEX any other purpose or distributed to any other persons or parti es.

Fire-resistive

construction, definition . . . . . . . . . . . . . . . . . . . 208.0 Partition, definition . . . . . . . . . . . . . . . . . . . . . . . . 208.0 Resistance rating, definition . . . . . . . . . . . . . . . . . 208.0 Wall, definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . 208.0 FIREPLACE

Decorative appliance for . . . . . . . . . . . . . . . . . . . .911.0 Factory-built . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .913.0 Gas vents . . . . . . . . . . . . . . . . . . . . . . . .912.0, E 602.1 Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .911.3 Stove, definition . . . . . . . . . . . . . . . . . . . . . . . . . . .208.0 Venting . . . . . . . . . . . . . . . . . . . . . . .802.0, 911.2, 912.0 Wood burning . . . . . . . . . . . . . . . . . . . . . . . . . .E 602.1 FITTINGS

Fuel gas piping . . . . . . . . . . . . . . . 1308.5.4, 1308.5.8,

1308.5.8.4, 1308.5.9, 1310.3.1 Fuel gas vent . . . . . . . . . . . . . . . . . . . .803.2.8, 803.2.9 Hydronic piping . . . . . . . . . . . . . . .1210.0, Table 1210.1 Refrigeration piping . . . . . . . . . . . . . .1109.1.1, 1109.1.2 FLAMMABLE VAPORS

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .208.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .902.7 FLOOD RESISTANT CONSTRUCTION

Coastal high hazard area . . . . . . . . . . . .205.0, 305.2.1 Design flood elevation . . . . . . . . . . . . . . . . . . . . . .206.0 Flood hazard area . . . . . . . . . . . . . . . . . . . . . . . . .208.0 Flood hazard resistance . . . . . . . . . . . . . . . . . . . .305.2 FLOOR FURNACE . . . . . . . . .(see Furnaces, floor furnace) FUEL

Appliance . . . . . . . . . . . . . . . . . . . . . .(see Appliances) Appliance, connectors, definition . . . . . . . . . . . . .203.0 Shutoff . . . . . . . . . . . . . . . . . . . . .513.4, 513.9, C 102.0,

Table 1003.2.1 Solid-fuel cooking . . . . . . . . . . . . .221.0, 508.6, 510.10,

511.1, 511.5, 513.13, 517.0 Temporary connection . . . . . . . . . . . . . . . . . . . . . .105.4 FUEL APPLIANCE CONNECTOR

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0 FUEL GAS

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208.0 FUEL GAS MIXING

BLOWERS AND MACHINES . . . . . . . . . . . . . . 1310.14.3,

1310.14.4, 1310.14.5 FUEL GAS PIPING

Cathodic protection . . . . . . . . . . . . . . . . . . . . . . D 105.0 Change in direction . . . . . . . . . . . . . . . . . . . . . . . 1310.7 Concealed location . . . . . . . . . . . . . . . . . . . . . . . 1310.3 Detection of leaks . . . . . . . . . . . . . . . . . . . . . . . . 1313.4 Electrical bonding and grounding. . . . . . . . . . . . . 1311.0 Inspection and testing . . . . . . . . . . . . . . 1303.0, 1313.0 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1310.0 Interconnections . . . . . . . . . . . . . . . . . . . . . . . . . 1308.3 Joints and fittings . . . . . . . . . . . . . . 1308.5.4–1308.5.9,

1313.2.1, 1313.2.2

Materials. . . . . . . . . . . . . . . . . . . . . . . . 1308.5, D 109.0 Obstruction of flow. . . . . . . . . . . . . . . . . . . . . . . 1310.12 Purging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1313.6 Sizing . . . . . . . . . . . . . 1308.4, 1314.0, 1315.0, D 108.0,

Table 1315.2(1)–Table 1315.2(36) Supports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1310.2.4,

Table 1310.2.4.1 Underground

installations . . . . . . . . . . . . . . 1308.5.2.3, 1308.5.3.3,

1310.0, D 101.2, D 109.3, D 110.3 Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1308.7.4 FUEL GAS TUBING

Cathodic protection . . . . . . . . . . . . . . . . . . . . . . D 105.0 Change in direction . . . . . . . . . . . . . . . . . . . . . . . 1310.7 Concealed location . . . . . . . . . . . . . . . . . . . . . . . 1310.3 Detection of leaks . . . . . . . . . . . . . . . . . . . . . . . . 1313.4 Electrical bonding and grounding. . . . . . . . . . . . . 1311.0 Inspection and testing . . . . . . . . . . . . . . 1303.0, 1313.0 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1310.0 Interconnections . . . . . . . . . . . . . . . . . . . . . . . . . 1308.3 Joints and fittings . . . . . . . . . . . . . . 1308.5.4–1308.5.9,

1313.2.1, 1313.2.2 Materials. . . . . . . . . . . . . . . . . . . . . . . . 1308.5, D 109.0 Obstruction of flow. . . . . . . . . . . . . . . . . . . . . . . 1310.12 Purging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1313.6 Sizing . . . . . . . . . . . . . . . . . . . . . . . . . . 1308.4, 1314.1,

1315.0, D 108.0, Table 1315.2(1)–Table 1315.2(36) Supports. . . . . . . . . . . . . . . . 1310.2.4, Table 1310.2.4.1 Underground installations . . . . . . . . . . . . . . 1308.5.2.3,

1308.5.3.3, 1310.1, D 101.2, D 109.3, D 110.3 Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1308.7.4 FURNACES

Approximate gas input . . . . . . . . . . . . . . Table 1308.4.1 Automatic control required. . . . . . . . . . . . . . . . . . . 607.6 Central heating furnaces . . . . . . . . . . . . . . 303.2, 904.0 Clearance for servicing . . . . . . . . . . . . . . . . . . . 304.4.3,

905.8.2, 906.11 Clearances . . . . . . . . . . . . . . . . . . . . . 303.10, 303.10.1,

904.2, 904.3.1.2, 905.1, 906.7, Table 303.10.1,

Table 904.2.2 Downflow-type,

heating, definition . . . . . . . . . . . . . . . . . . . . . . .208.0 Duct furnace . . . . . . . . . . . . . . . . . . . . . . .206.0, 905.0 Enclosed furnace, definition . . . . . . . . . . . . . . . . .208.0 Floor furnace . . . . . . . . . . . . . . . . . . . . . . .208.0, 906.0 Forced-air heating, definition . . . . . . . . . . . . . . . . .208.0 Furnace plenums . . . . . . . . . . . . . . . .802.3.5, 903.2.3,

904.7

Gravity-type, floor

furnace, definition . . . . . . . . . . . . . . . . . . . . . . . 209.0

496 2019 CALIFORNIA MECHANICAL CODE

INDEX

Horizontal-type furnace . . . . . . . . . . . . . . 208.0, 904.10 Oil-fired central furnace. . . . . . . . . . . . . . . . . . . . 904.12 Seepage pan, floor furnace . . . . . . . . . . . . . . . . . 906.9 Solid fuel furnace . . . . . . . . . . . . . . . . . . . . . . . . 904.11 Upflow-type, heating . . . . . . . . . . . . . . . . 208.0, 904.10 Wall furnace, vented . . . . . . . . . . . . . . . . . 224.0, 907.0,

Table 802.4 Warm air. . . . . . . . . . . . . . . 225.0, 607.6, 607.7, C 105.1 FUSIBLE LINK

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208.0 FUSIBLE PLUG

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208.0

– G – GALVANIZED STEEL

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209.0 GAS CONVENIENCE OUTLET . . . . . . . . . . . . . . . . . 1312.8 GAS ENGINE, STATIONARY . . . . . . . . . . . . . . . . . . 1602.0 GAS ENGINES,

AIR CONDITIONERS . . . . . . . . . . . . . . . . . . . . . . 903.2.2 GAS VENT CONNECTOR . . . . . . . . . . . . . (see Connectors,

gas vent) GAS VENT,

SURROUNDING SPACE . . . . . . . . . . . . . . . . . . . 802.5.11 GAS-FIRED

Air conditioners

and heat pumps . . . . . . . . . . . . . . . . . . . . . . . . 903.2 Clothes dryers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 908.2 Household cooking appliances. . . . . . . . . . . . . . . 920.2 Industrial air heaters. . . . . . . . . . . . . . . . . . 914.0, 915.0 Room heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 916.2 Toilets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 929.0 GAS FIREPLACE, VENTED . . . . . . . . . . . . . . . . . . . . 912.0 GASEOUS HYDROGEN SYSTEMS . . . . . . . . . . . . . . 937.0 GAUGES, STEAM BOILERS . . . . . . . . . . . . . . . . . . 1003.3 GENERATORS

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209.0 Engine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1602.0 Steam . . . . . . . . . . . . . . . . . . . . . . . . . . . . 918.1, 1011.0 GRAVITY

Definition, heating system. . . . . . . . . . . . . . . . . . . 209.0 Type floor furnace . . . . . . . . . . . . . . . . . . . 209.0, 306.1,

Table 904.2.2 Venting system . . . . . . . . . . . . . . . 224.0, 931.5.3, 931.6 GREASE

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209.0 Ducts . . . . . . . . . . . . . . . . . . . . . 209.0, 510.1.3, 510.1.7 Ducts, four stories or more . . . . . . . . . . . . . . . . . 517.4.2 Drip trays. . . . . . . . . . . . . . . . . . . . . . 509.2.4, 509.2.4.1 Filter mesh type, definition . . . . . . . . . . . . . . . . . . 209.0 Filters . . . . . . . . . . . . . . . . . . . . . 209.0, 509.1, 509.2.3,

509.2.4, 509.2.5, 516.3.2 Laden vapors. . . . . . . . . . . . . . . . 507.2, 508.3.1, 508.5,

511.2.2, 511.4.6,

513.1.1, 516.1

Receptacle. . . . . . . . . . . . . . . . . . . . 511.1.2.1, 511.1.3.1,

511.1.3.2 Removal devices . . . . . . . . . . . . . . 209.0, 507.4, 509.0,

513.1, 513.2.5, 516.1, 517.5 Vapors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508.3.1 GRILLES AND LOUVERS . . . . . . . . . . . . . . . . . . . . . 701.10 GROUNDING ELECTRODE . . . . . . . . . . . . . . 209.0, 1311.0

– H – HANGERS AND SUPPORTS

Appliances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .303.4 Ducts . . . . . . . . . . . . . . . . . . . . . . . . . . . .506.7, 510.1.6,

510.1.7, 603.3 Fuel gas piping . . . . . . . . . . . . . . . . . . .313.7, 1310.2.4,

Table 1310.2.4.1 Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . .917.1, 926.1 Hydronics system piping . . . . . . . . . . . . . . . . . . .1210.3 In ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .313.5 Piping and tubing . . . . . . . . . . . . . . .313.0, Table 313.3 Refrigeration equipment . . . . . . . . . . . . . . . . . . .1105.2 HEALTH FACILITIES . . . . . . . . . . . . . . . . . . . . . . . . . . 1602.0

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210.0 HEAT (ENERGY)

RECOVERY VENTILATORS . . . . . . . . . . . . . . . . . . 504.5 HEAT PUMPS

Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E 505.1.2 Auxiliary Heat Control . . . . . . . . . . . . . . . . . E 503.4.6.6 Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210.0 Hydronic (water loop) . . . . . . E 503.5.5.2.3, E 503.5.7.4 In low-rise buildings . . . . . . . . . . . . . E 502.0, E 502.7.2 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 903.2 Labeling . . . . . . . . . . . . . . . . . . . . . . 307.3, E 503.4.4.1 Minimum efficiency . . . . . . . . . . . . . . . . . Table E 502.9,

Table E 503.7.1(2),

Table E 503.7.1(4) Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307.3 Other than

low-rise buildings, HVAC. . . . . . . . . . . . . . . E 503.3.1 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E 805.3 HEATER

Air. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 914.0, 915.0 Aircraft hangars. . . . . . . . . . . . . . . . . . . . . . . . . . 303.12 Clearances . . . . . . . . . . . . . . . . . . . . . (see Clearances) Direct gas-fired industrial air. . . . . . . . . . . . 914.0, 915.0 Duct, electric. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306.1 Efficiency . . . . . . . . . . . . . . . . . . . . . . Table E 503.7.1(5) Infrared . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 928.0 Pool. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 929.0 Radiant room, definition . . . . . . . . . . . . . . . . . . . . 220.0 Room . . . . . . . . . . . . . . . . . . . . . . 220.0, 802.2.1, 916.0 Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223.0, 917.0 Wall. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225.0 Water. . . . . . . . . . . . . . . . . . . . . 225.0, 802.2.1, 1203.2,

1203.3, Table 1203.2

2019 CALIFORNIA MECHANICAL CODE 497

INDEX any other purpose or distributed to any other persons or parti es.

HEATING

Air system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311.0 Appliances. . . . . . . . . . . . . . . (see Appliances, heating) Equipment, industrial,

definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211.0 Gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209.0 Plant, central, definition. . . . . . . . . . . . . . . . . . . . . 205.0 Plant, district, definition. . . . . . . . . . . . . . . . . . . . . 206.0 System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210.0, 311.0 HEATING DEGREE DAY

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210.0 HIGH-RISE BUILDINGS

Existing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.11.3.4 Fees. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.11.4 New Construction. . . . . . . . . . . . . . . . . . . . . . . . 1.11.3.3 HOODS

Airflow rate. . . . . . . . . . . . . . . . . . . . . . 508.5, 508.5.2.2 Canopy-type . . . . . . . . . . . . . . . . . . . . . 508.5.1, 931.5.2 Capacity . . . . . . . . . . . . . . . . . . . . . 508.5.1.1, 508.5.2.2 Clearance . . . . . . . . . . . . . (see Clearances for, hoods) Commercial cooking . . . . . . . . . . . . . . . . . . . . . . . 508.0 Compensating. . . . . . . . . . . . . . . . . . . . . . . 205.0, 511.3 Construction. . . . . . . . . . . . . . . . . 508.3, 519.2, 508.3.2 Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210.0 Draft . . . . . . . . . . . . . . . . . . . . . . . 206.0, 802.12, 905.4 Eyebrow-type. . . . . . . . . . . . . . . . . . . . . . . . . . . 508.3.3 Exhaust outlet. . . . . . . . . . . . . . . . . . . . . . . . . . . . 508.7 Fixed baffle . . . . . . . . . . . . . . . . . . . . . . . 210.0, 513.2.5 For dishwashing machines. . . . . . . . . . . . . 519.1, 519.3 For kilns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 931.5.2 Grease removal devices in . . . . . . . . . . . . . . . . . . 509.0 Inspection and cleaning . . . . . . . . . 514.2, 514.3, 514.4 Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508.3.4 Integrated supply-air plenums . . . . . . . . . . . . . . 508.3.5 Labeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508.5.3 Laboratory fume . . . . . . . . . . . . . . . . . . . . . . . . . . 410.3 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508.1 Noncanopy-type. . . . . . . . . . . . . . . . . . . . . . . . . 508.5.2 Product conveying . . . . . . . . . . . . . . . . . . . . . . . . 505.11 Seams, joints and penetration . . . . . . . . . . . . . . 508.3.1 Size. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508.5 Solid-fuel. . . . . . . . . . . . . . . . . . . . . . . . . . . 508.6, 517.3 Type I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210.0, 508.3 Type II. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210.0, 519.2 Ultraviolet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508.2.1 Ventilating . . . . . . . . . . . . . . . . . . . . . . 802.2.1, 802.2.4,

802.3.4, 802.12, 922.3 HOT PLATES . . . . . . . . . . . . . . . . . . . . . . . . . . 919.1–919.3, HYDRONIC SPACE HEATING . . . . . . . . . . . . . . . . . 1215.0 HYDRONICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 12

Auxiliary systems . . . . . . . . . . . . . . . . . . . . . . . . 1220.0 Appliances and equipment . . . . . . . . . . . . . . . . . 1207.0 Boilers . . . . . . . . . . . . . . . . . . 1207.2, 1207.2.1, 1207.2.2 Circulators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1208.0 Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1221.6 Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210.0

. . . . . . . . . . 1220.0 Appliances and equipment . . . . . . . . . . . . . . . . . 1207.0 Boilers . . . . . . . . . . . . . . . . . . 1207.2, 1207.2.1, 1207.2.2 Circulators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1208.0 Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1221.6 Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210.0

Embedded piping and joints . . . . . . . . . . . . . . . . 1221.2 Expansion tanks . . . . . . . . . . . . . . . . . . . . . . . . . 1209.0 Hangers and supports. . . . . . . . . . . . . . . . . . . . . 1210.3 Heat sources . . . . . . . . . . . . . . . . . . . . . . . . . . . 1203.1 Heat transfer medium . . . . . . . . . . . . . . . . . . . . . 1215.5 Identification of piping . . . . . . . . . . . . . . . . . . . . . 1204.0 Installation . . . . . . . . . . . . . . . . . . . . . . . 1205.0, 1221.0 Insulation . . . . . . . . . . . . . . . 1201.2, 1220.2.5, 1217.5.2 Joints and connections . . . . . . . . . . . . . . . . . . . . 1211.0 Materials . . . . . . . . . . . . . . . . . . . . 1210.0, Table 1210.1 Protection of potable water supply . . . . . . . . . . . 1202.0 Radiant heating and cooling . . . . . . . . . . . . . . . . 1217.0 Snow melt systems . . . . . . . . . . . . . . 1220.2, 1220.2.1,

1217.5.2, Table 1220.2.1 Safety devices. . . . . . . . . . . . . . . . . . . . . . . . . . . 1206.0 Steam systems . . . . . . . . . . . . . . . . . . . . . . . . . . 1216.0 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . 1205.2, 1221.3 Water heaters . . . . . . . . . . . . . . . . . . . . 1203.2, 1203.3,

1207.3, Table 1203.2

– I – IDLH

Definition,. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211.0 Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . 1106.2.2 INCINERATORS

Commercial and

industrial type . . . . . . . . . . . . . . . . . . . . . . . . . . 925.0 Fume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208.0, 512.3 Residential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 925.3 INDUSTRIAL HEATING EQUIPMENT

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211.0 INSANITARY LOCATION

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211.0 INSPECTIONS

Chimneys. . . . . . . . . . . . . . . . . . . . . . . 802.5.6, 802.5.7 Commercial kitchen

exhaust system, schedule of . . . . . . . . . . Table 514.3 Evaporative cooler . . . . . . . . . . . . . . . . . . . . . . . . 933.3 Fire-extinguishing equipment . . . . . . . . . . . . . . . . 514.2 Fuel gas piping. . . . . . . . . . . . . . . . . . . . . . . . . . 1303.0,

1304.0, 1313.1 Reinspections . . . . . . . . . . . . . . . . . . . . . . . . . . 105.2.6 Requests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.2.3 INSTALLATIONS OF

Appliances in manufactured housing . . . . . . . . . . 930.0 Appliances in garages. . . . . . . . . . . . . . . . . . . . . . 305.1 Appliances in repair garages . . . . . . . . . . . . . . 303.11.1 Ducts. . . . . . . . . . . . . . . . . . . . . . . . . . . . 510.5.3, 603.0 Equipment and appliances . . . . . . . . . . . . . . . . . . 303.0 Gas piping . . . . . . . . . . . . . . . . . . . . . . . 1310.0, 1310.2,

1310.9, 1312.10 Overhead heaters in

commercial garages

and aircraft hangars. . . . . . . . . . . . . . . 905.7, 926.4

498 2019 CALIFORNIA MECHANICAL CODE

INDEX

INSULATION OF

Ducts. . . . . . . . . . . . . . . . . . . . . . . . . 506.11.2, 506.11.3,

604.0, E 502.4.1, E 503.4.7, Table E 503.7.2, Hoods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508.3.4 Hydronic systems . . . . . . . . . . . . . . . . . . . . . . . . 1205.0 HVAC system piping. . . . . . . . . . . . . . . . . . . . . E 502.5,

E 503.4.7.1.2, Table E 502.5, Table E 503.7.3(1) INTERLOCK

Air heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 914.7 Cooking equipment

ventilation . . . . . . . . . . . . . . . . . . . . . . 517.1.3, 517.6.2 Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211.0 Exhaust. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 503.1 Gas mixing machines. . . . . . . . . . . . . . . . . . . 1310.14.5 Inspection of safety . . . . . . . . . . . . . . . . . . . . . . 516.6.4 Mechanical air supply . . . . . . . . . . . . . . . . . . . . . 701.9.2 Motorized louvers . . . . . . . . . . . . . . . . . . . . . . . 701.10.2 Recirculating systems . . . . . . . . . . . . . . . . . . . . . . 516.3 Stack dampers . . . . . . . . . . . . . . . . . . . . . . . . . . 1003.4

– J – JOINTS AND CONNECTIONS . . . . . . . . . . . . . . . . . 1109.2,

1109.8, 1211.0, 1308.5.8–1308.5.10.6, E 506.0 Brazed joint . . . . . . . . . . . . . . . . . . . . . . . 212.0, 1211.3 Copper or copper

alloy pipe or tubing . . . . . . . 1109.2, 1211.3, 1211.14.1 CPVC piping . . . . . . . . . . . . . . . . . . . . . 1211.2, E 506.7 Embedded piping and joints . . . . . . . . . . . . . . . . 1221.2 Expansion joint. . . . . . . . . . . . . . . . . . . . . . . . . 1313.2.2 Flared. . . . . . . . . . . . . . . . . . . . . . . . . . . . 212.0, 1211.3,

1308.5.8.3, 1308.5.8.4 Mechanical joint . . . . . . . . . . . . . . 212.0, 1109.7, 1211.5,

1211.6, 1211.7, 1211.8, 1211.11, 1211.12, 1308.5.9.3, E 506.5, E 506.10.2 PE pipe or tubing . . . . . . . . . . . . . . . . . . 1211.7, E 506.9 PE-AL-PE pipe or tubing . . . . . . . . . . . . . . . . . . . 1211.8 PE-RT piping or tubing. . . . . . . . . . . . . 1211.9, E 506.11 PEX pipe or tubing. . . . . . . . . . . . . . . . . 1211.5, E 506.8 PEX-AL-PEX pipe or tubing . . . . . . . . . . . . . . . . . 1211.6 Plastic piping, joints, and fittings . . . . . . . . . . . 1211.14.2 PP piping or tubing. . . . . . . . . . . . . . . 1211.10, E 506.10 Press-Connect, definition . . . . . . . . . . . . . . . . . . . 212.0 PVC piping . . . . . . . . . . . . . . . . . . . . . 1211.11, E 506.12 Soldered joint . . . . . . . . . . 212.0, E 506.8.2, E 506.11.2 Solvent cement

plastic pipe. . . . . . . . . . . . . . . . . . . . . 1211.2, 1211.11,

E 506.7.2, E 506.12.1

Steel pipe or tubing . . . . . . . . . . . . . . . . 1109.2, 1211.12 Threaded joint . . . . . . . . . . . . . . . . . . . . 1211.2, 1211.12,

E 506.7.1, E 506.12.2 Various materials . . . . . . . . . . . . . . . . . 1211.13, E 506.2 Welded joint. . . . . . . . . . . . . . . . . . . . . . . 212.0, 1211.12 Welded joint (thermoplastic) . . . . . . . . . . . . . . . E 506.6 JUMPER, BONDING

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0 Fuel gas piping. . . . . . . . . . . . . . . . . . . . . . . . . . . 1311.2

– K – KILNS, SMALL CERAMICS . . . . . . . . . . . . . . . . . . . . 931.0 KITCHEN HOODS, COMMERCIAL . . . . . . . . . . . . . . 508.0

– L – LABELED

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0 LABELS AND INSTRUCTIONS

For appliances. . . . . . . . . . . . . . . . . . . . . . . . . . . . 307.0 For heating appliances . . . . . . . . . . . . . . . . . . . . . 307.0 For hydronic systems . . . . . . . . . . . . . . . . . . . . . 1204.0 For refrigerating systems . . . . . . . . . . . . . . . . . . . 1115.0 For type I hoods. . . . . . . . . . . . . . . . . . . . . . . . . 508.5.3 LABORATORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 410.0 LADDER, PERMANENT . . . . . . . . . . . . . . . . . . . . 304.3.1.2 LEAKS

Fuel gas . . . . . . . . . . . . . . . . . . . . . . . . . 1313.4, 1313.5 LOWER FLAMMABILITY LIMIT (LFL)

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0 Product conveying ducts . . . . . . . . . . . . . . 505.1, 505.3 Refrigeration . . . . . . . . . . . . . . . . . . . 1104.4, 1106.2.5.2 LINE CONTACT INSTALLATION

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0 LIQUEFIED PETROLEUM GAS (LPG)

Appliances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303.7.1 Automatic control devices . . . . . . . . . . . . . . . . . . . 306.0 Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0 Gas Facilities . . . . . . . . . . . . . . . . . . . . . 214.0, 1312.11 Shutoff devices. . . . . . . . . . . . . . . . . . . . . . . . . . D 110.4 Supply connections . . . . . . . . . . . . . . . D 101.2, D 106.1 LISTED

. . . . . . . . . 303.7.1 Automatic control devices . . . . . . . . . . . . . . . . . . . 306.0 Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0 Gas Facilities . . . . . . . . . . . . . . . . . . . . . 214.0, 1312.11 Shutoff devices. . . . . . . . . . . . . . . . . . . . . . . . . . D 110.4 Supply connections . . . . . . . . . . . . . . . D 101.2, D 106.1 LISTED

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0 LISTED AND LISTING

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0 LISTING AGENCY

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0 LOCATION OF

Appliances in garages . . . . . . . . 305.1.1, 305.1.2, 905.7 Appliances subject to

mechanical damage . . . . . . . . . . . . . . . . . . . . 305.1.1 Boilers, central heating . . . . . . . . . . . . . . . . . . . . . 904.1 Draft hoods and controls . . . . . . . . . . . . . 802.12, 905.4 Evaporative cooling systems. . . . . . . . . . . . . . . . . 933.2 Pool heaters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 927.1 Refrigerating equipment . . . . . . . . . . . . . . . . . . . 1106.1 Wall furnaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 907.2

2019 CALIFORNIA MECHANICAL CODE 499

INDEX any other purpose or distributed to any other persons or parti es.

LOUVERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315.0 LOUVERS, GRILLES,

AND SCREENS . . . . . . . . . . . . . . . . . . . . . . . . . . . 701.10 LOW-PRESSURE

HOT-WATER-HEATING BOILER

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0 LOW-PRESSURE STEAM-HEATING BOILER

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0 LOW-WATER CUTOFF . . . . . . . . . . . . . . . . . . . . . . . 1008.0

– M – MACHINERY

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215.0 MACHINERY ROOM, REFRIGERATION

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215.0 Equipment and controls in. . . . . . . . . . . . . . . . . . 1108.0 Detectors and alarms . . . . . . . . . . . . . . . . . . 1106.2.2.1 Ventilation of . . . . . . . . . . . . . . . . . . . 1106.2.3, 1106.2.4 Where required . . . . . . . . . . . . . . . . . . . . . . . . . . 1106.0 MAKEUP AIR . . . . . . . . . . . . . . . . . . . . . . (see Air, Makeup) MARKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302.1.1 MASONRY, CHIMNEYS . . . . . . . . . (see Chimney, masonry) MATERIALS

Alternate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302.2 For construction of

hoods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508.3 For piping, containers, and valves of

refrigeration systems . . . . . . . . . . . . . . . . . . . . 1109.1 For ducts . . . . . . . . . . . . . . . . . . . 506.1, 510.5.1, 602.0 For fuel piping. . . . . . . . . . . . . . . . . . . . 1308.0, D 109.0 For piping, tubing

and fittings hydronics . . . . . . . . . 1210.0, Table 1210.1 For vent connectors. . . . . . . . . . . 802.10.1.1–802.10.1.4 MECHANICAL

Combustion air supply. . . . . . . . . . . . . . . 701.9, E 502.6 Exhaust system. . . . . . . . . . . . . . . . . . . . . . . . . . . 505.1 Ventilating system . . . . . . . . . . . . . . . . . . . . . . . . 402.3,

1106.8, E 502.6, E 605.1.2, Table E 502.6 MECHANICAL EXHAUSTING FOR

Bathrooms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E 605.2 Low-rise residential dwelling . . . . . . . . . . . . . . E 605.1.3 Product conveying. . . . . . . . . . . . . . . . . . . . . . . . . 505.0 Refrigeration . . . . . . . . . . . . . . . . . . . . 1105.5.2, 1106.0, MECHANICAL JOINTS . . . . . . . . . . . . . . . . . . . . (see Joints

and connections) MECHANICAL PERMIT FEE . . . . . . . . . 104.5, Table 104.5 MECHANICAL SYSTEMS

Application to existing . . . . . . . . . . . . . . . . . . . . . . 102.2 Essential provisions. . . . . . . . . . . . . . . . . . . . . . . . 321.0 In elevator shaft. . . . . . . . . . . . . . . . . . . . . . . . . . . 305.3 METAL

Chimneys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 802.5.2 Ducts. . . . . . . . . . . . . . . . . . . . . . . . 506.1, 602.3, 603.3 METER, GAS . . . . . . . . . . . . . . . . . . . . . . . . 1308.6, D 104.0

METHODS OF CONSTRUCTION,

ALTERNATES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302.2 MINIMUM REQUIREMENTS

Purpose of Code . . . . . . . . . . . . . . . . . . . . . . . . . . 101.3 MINIMUM STANDARDS . . . . . . . . . . . . . . . . . . . . . . . 302.1 MOBILE HOME PARKS

FUEL GAS EQUIPMENT

AND INSTALLATION . . . . . . . . . . . . . . . . . . . . . D 101.1 MOTORS, FANS, AND FILTERS . . . . . . . . . . . . . . . . . 503.0 MULTIPLE-ZONE SYSTEM . . . . . . . . . . . . . . . . . . . . . 404.0

– N – NATURAL VENTILATION

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216.0 Floor area to be ventilated . . . . . . . . . . . . . . . . . 402.2.1 Indoor air quality for

low-rise residential buildings . . . . . . . . . . . . . E 605.1 Location and size openings . . . . . . . . . . . . . . . . 402.2.2 Refrigeration systems . . . . . . . . . . . . . . . . . . . . . 1106.3 Systems . . . . . . . . . . . . . . . . . . . . . . . . . 402.2, 402.2.1 NEONATAL INTENSIVE CARE UNITS

Formula preparation area . . . . . . . . . . . . . . . . . . . 419.1 Treatment Area/Room . . . . . . . . . . . . . . . . . . . . . . 419.2 NONCOMBUSTIBLE MATERIAL

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216.0 NON-GREASE DUCTS . . . . . . . . . . . . . . . . . . . . . . . . 519.4 NUISANCE

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216.0

– O – OCCUPATION CLASSIFICATION

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217.0 ODOROUS ROOMS . . . . . . . . . . . . . . . . . . . . . . . . . . . 413.0 OIL BURNING BOILERS . . . . . . . . . . . . . (see Boiler types,

oil burning) OPEN TOP BROILER UNIT . . . . . . . . . . . . . . . . . . . . 922.0 OPENINGS

Air heaters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 914.7 Attics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E 502.11 Ducts. . . . . . . . . . . . . . . . . . . . . . . 506.6, 510.1.4, 510.3 Exhaust and intake . . . . . . . . . . . . . . . . . 305.2.2, 926.3 For access . . . . . . . . . . . . . . . . . . . . . . . 506.3, 510.1.4,

514.1.2, 1406.2.1.4 For combustion air. . . . . . . . . . . . . . . . . . 701.6, C 109.1 Furnaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 906.8 Illuminating appliances . . . . . . . . . . . . . . . . . . . . . 924.4 Ratproofing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316.10 Relief. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 914.7 Screens . . . . . . . . . . . . . . . . . . . . . . . . . . 402.4, 802.1.2 Ventilation . . . . . . . . . . . . 402.2.1, 402.2.1.1, 402.2.1.2,

402.2.1.3, 402.2.1.4, 402.2.2, 402.2.3, 802.1.2, 802.10.3, 1105.5.1, 1106.3, E 605.1.1

500 2019 CALIFORNIA MECHANICAL CODE

INDEX

OUTDOOR AIR INTAKES . . . . . . . . . . . . . . . . . . . . . . . 407.2 OUTDOOR AIR RATE

Calculation . . . . . . . . . . . . . . . . . . . . . . . . . Appendix G OUTLETS

Appliance flue . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0,

802.10.5, 803.1.1 Draft hood . . . . . . . . . . . . 802.10.2.1, 802.10.5, 803.1.1 Exhaust. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508.7 Fuel gas piping . . . . . . . . . . . . . 1305.2, 1306.3, 1310.9,

1312.8, 1314.4 OVER PRESSURE PROTECTION

Fuel gas piping. . . . . . . . . . . . . . . . . . . 1308.7.1, 1310.6 OVERHEAD HEATERS

In garages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 926.4

– P – PENALTIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106.2, 106.3 PERMISSIBLE EXPOSURE

LIMIT (PEL)

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.0 PERMITS

Application. . . . . . . . . . . . . . . . . . . . . . . . . 103.3, 104.3,

302.3.1, 1402.0 Construction documents . . . . . . . . . . . . . . . . . . 104.3.1 Exempt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104.2 Expiration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104.4.3 Fees . . . . . . . . . . . . . . . . . . . . . . . . . 104.5, Table 104.5 For alteration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104.1 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.0 Investigation fees . . . . . . . . . . . . . . . . . . . . . . . . 104.5.2 Issuance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104.4 Mechanical systems . . . . . . . . . . . . . . . . . . . . . . . 104.0 Retention of plans . . . . . . . . . . . . . . . . . . . . . . . 104.4.6 Suspension or revocation of. . . . . . . . . . . . . . . . 104.4.5 To operate boiler or

pressure vessel . . . . . . . . . . . . . . . . . . . . . . . . 1013.2 Validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104.4.2 Work without . . . . . . . . . . . . . . . . . . . . . . . . . . . 104.5.1 PERMITS AND INSPECTIONS . . . . . . . . . . . . 104.0, 105.0,

302.3.1, 302.3.6 PHARMACIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 505.12 PILOT

Boilers. . . . . . . . . . . . . . . . . . . . . . . . . . . 1006.1, 1007.1,

C 106.0, C 107.0 Continuous, definition . . . . . . . . . . . . . . . . . . . . . . 205.0 Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.0 Intermittent, definition. . . . . . . . . . . . . . . . . . . . . . . 211.0 Interrupted, definition . . . . . . . . . . . . . . . . . . . . . . . 211.0 PIPING

Fuel gas . . . . . . . . . . . . . . . . . . . . . . . . . 1308.0, 1310.0 Hangers and supports . . . . . . . . . . . . . . . 313.0, 1105.2,

1109.6, 1210.3, 1310.2.4, 1310.2.4.1,

Table 313.3, Table 1310.2.4.1

Hydronics . . . . . . . . . . . . . . . . . . . 1210.0, Table 1210.1 Identification . . . . . . . . . . . . . . . . . . . . . 1109.10, 1204.0 Joints and connections. . . . . . . . . . . . . . . . . (see Joints

and connections) Protection of . . . . . . . . . . . . . . . . . . . . . 316.0, 1109.4.1,

1310.1.3, 1310.1.4 Trenching, excavation,

and backfill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317.0 Underground . . . . . . . . . . . . . 1109.5, 1109.5.1, 1310.1.6 PIPING TYPES

Double-wall . . . . . . . . . . . . . . . . . . . . . Table 803.1.2(1),

Table 803.1.2(2), Table 803.2(1), Table 803.2(2) Single-wall metal . . . . . . . . . . . . 802.7, Table 803.1.2(5) PLANS

Approval by Authority

Having Jurisdiction . . . . . . . . . . . . . . . . . . . . . . . 104.3 Retention of . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104.4.6 Review fees . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104.3.2 PLENUMS

Applicability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 601.1 Closure systems . . . . . . . . . . . . . . . . . . . . . . . . . 603.10 Combustibles within . . . . . . . . . . . . . . . . . . . . . . . 602.2 Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.0 Furnace. . . . . . . . . . . . . . . . . . . . . . . . 802.3.5, 903.2.3,

903.2.5, 904.2, 904.7 Heating and cooling system . . . . . . . . 604.1, E 503.3.1 Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 516.6.3 Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . E 503.4.7.1.1 Leakage . . . . . . . . . . . . . . . . . . . . . . . . . . E 503.4.7.2.1 Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 602.1 Metal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 602.3 Serving type II hoods . . . . . . . . . . . . . . . . . . . . . 510.1.7 Supply-air. . . . . . . . . . . . . . . . . . . . . 508.3.5, 508.3.5.3,

508.3.5.3.3, 607.0, E 503.4.7.1.1 Use of under-floor as supply plenum . . . . . . . . . . . 607.0 Where dampers are required . . . . . . . . . . . . . . . . 701.12 PLUMBING CODE

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.0 POLYETHYLENE (PE) PIPE OR TUBING

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.0 Fuel gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1308.5.4,

Table 1315.2(19)–Table 1315.2(23),

Table 1315.2(34)–Table 1315.2(36) Hydronics . . . . . . . . . . . . . . . . . . . 1210.0, Table 1210.1 Joining

and connections . . . . . . . . . . . . . . . . . . . . (see Joints

and connections) POLYETHYLENE-ALUMINUM-POLYETHYLENE (PE-AL-PE) PIPE OR TUBING

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.0 Ground source loop . . . . . Table E 505.5, Table E 505.6 Hydronics . . . . . . . . . . . . . . . . . . . 1210.0, Table 1210.1 Joining and connections. . . . . . . . . . . . . . . . (see Joints

and connections)

2019 CALIFORNIA MECHANICAL CODE 501

INDEX any other purpose or distributed to any other persons or parti es.

POLYETHYLENE OF RAISED TEMPERATURE (PE-RT) PIPE OR TUBING

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.0 Ground source loop . . . . . . . . . . . . . . . . Table E 505.5,

Table E 505.6 Hydronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1210.0,

Table 1210.1, Table 1220.2.1 Joining and connections. . . . . . . . . . . . . . . . (see Joints

and connections) Oxygen diffusion . . . . . . . . . . . . . . . . . . . . . . . . . 1210.4 POLYPROPYLENE (PP) PIPE OR TUBING

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.0 Ground source loop . . . . . . . . . . . . . . . . Table E 505.5,

Table E 505.6 Hydronics . . . . . . . . . . . . . . . . . . . 1210.0, Table 1210.1 Joining and connections. . . . . . . . . . . . . . . . (see Joints

and connections) POLYVINYL CHLORIDE (PVC) PIPE OR TUBING

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.0 Ground source loop . . . . . Table E 505.5, Table E 505.6 Hydronics . . . . . . . . . . . . . . . . . . . 1210.0, Table 1210.1 PORTABLE

Cooling unit . . . . . . . . . . . . . . . . . . . . . . . . 104.2, 218.0 Evaporative cooler . . . . . . . . . . . . . . . . . . . 104.2, 218.0 Fire extinguishers . . . . . . . . . . . . . . . . . . . 513.2, 513.11 Heating appliance . . . . . . . . . . . . . . . . . . . 104.2, 218.0 Ventilating equipment. . . . . . . . . . . . . . . . . 104.2, 218.0 POSITIVE DISPLACEMENT COMPRESSOR

Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1112.2 POWER BOILER PLANT

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.0 PRESSURE

Design, definition . . . . . . . . . . . . . . . . . . . . . . . . . 218.0 Field test, definition . . . . . . . . . . . . . . . . . . . . . . . . 218.0 Imposing element, definition . . . . . . . . . . . . . . . . . 218.0 Limiting devices. . . . . . . . . . . . . . . . . . . . . 218.0, 904.4,

927.3, 1111.0, 1308.7.6 Relief devices . . . . . . . . . . . . . . . . 218.0, 904.6, 1112.0,

1113.0, 1115.4, C 109.1 Tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D 113.6.2 Test, definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.0 Vessel . . . . . . . . . . . . . . . . . . . . . . . .218.0, Chapter 10,

1113.0, 1117.0 Vessel, refrigerant . . . . . . . . . . . . .218.0, 1113.0, 1117.0 PRESSURE-RELIEF VALVE

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224.0 Discharge . . . . . . . . . . 1005.2, 1112.10, 1112.11, 1206.2 Hydronics . . . . . . . . . . . . . . . . . . . . . . . 1206.0, E 507.8 Pressure vessels . . . . . . . . . . . . . . . . . . 1005.0, 1113.0, Refrigeration system. . . . . 1111.2, 1112.0, 1113.0, 1115.4 Steam and hot

water boilers (low pressure) . . . . . . . . . . . . . . . 904.6 PROTECTION

Fire . . . . . . . . . . . . . . . . . . . . .506.8, 507.4.3.1, 510.3.7,

512.3.1, 513.2.1, 516.2.3, 516.5, 1108.1, 1406.2.1.4

Overpressure . . . . . . . . . . . . . . . . . . . . .1308.8, 1310.6 Personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .301.6 Piping, materials, and structures . . . . . . . . . . . . . .316.0 PROTECTIVE ENVIRONMENT ROOMS . . . . . . . . . . . 415.0 PURGE

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .218.0 Fuel gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1313.6

– R – RADIANT HEATING AND COOLING . . . . . . . . . . . . .1217.0 RADIANT ROOM HEATER

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220.0 RANGE

Commercial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .921.1 Domestic . . . . . . . . . . . . . . . . . . . . . . . . . .504.3, 920.0 Oil burning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .921.3 Ventilation of . . . . . . . . . . . . . . . . . . . . . . . . . . . . .504.3 RATPROOFING . . . . . . . . . . . . . . . . . . . . . . . . . . . . .316.10 RECIRCULATING SYSTEMS

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220.0 Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .516.0 Labeling . . . . . . . . . . . . . . . . . . . . . . . .516.2.4, 516.2.5 Listing . . . . . . . . . . . . . . . . . . .516.2.2, 516.2.5, 516.2.9 Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .403.5 REFRIGERANTS

Ammonia . . . . . . . . . . . . . . . . . . . . . . . .1102.1, 1104.4,

1104.5, 1106.1.4, 1106.5, 1106.0, 1114.1, Table 1102.3, Table E 503.7.1(7) Amount of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1104.2 Applications for human comfort . . . . . . . . . . . . . .1104.6 Azeotrope, definition . . . . . . . . . . . . . . . . . . . . . . .203.0 Changing of . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1104.8 Classification of . . . . . . . . . . . . . . . . . . . . . . . . . .1103.0 Concentration limit . . . . . . . . . . . . . . . . . . . . . . . .1104.2 Containers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1109.0 Emergency purge . . . . . . . . . . . . . . . . . . . . . . . .1106.0 Flammable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1104.5 In institutional occupancies . . . . . . . . . . . . . . . . .1104.3 In nonindustrial occupancies . . . . . . . . . . . . . . . .1104.6 Parts in ducts. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1106.9 Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1109.0 Port protection . . . . . . . . . . . . . . . . . . . . . . . . . . 1105.11 Pressure vessel . . . . . . . . . . . . . . . 218.0, 1113.0, 1117.0 Purity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1104.7 Mixing of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1104.7.4 Reclaimed . . . . . . . . . . . . . . . . . . . . . . . 220.0, 1104.7.3 Recovered . . . . . . . . . . . . . . . . . . . . . . . 220.0, 1104.7.1 Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1101.2 Recycled . . . . . . . . . . . . . . . . . . . . . . . . 220.0, 1104.7.2 Refrigerant designation, definition . . . . . . . . . . . . 220.0 Requirements for . . . . . . . . . . . . . . . . . . . . . . . . . 1104.0 Safety classification, definition . . . . . . . . . . . . . . . 220.0 Storage of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1105.12 Types used. . . . . . . . . . . . . 1102.3, 1104.7, Table 1102.3 Zeotropic, definition. . . . . . . . . . . . . . . . . . . . . . . . 228.0

502 2019 CALIFORNIA MECHANICAL CODE

INDEX

REFRIGERATION EQUIPMENT

Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1105.3 Coils . . . . . . . . . . . . . . . . . 310.6, 903.2.6, 904.8, 905.6 Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1108.0 Identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1115.0 Illumination and

service receptacles . . . . . . . . . . . . . . . . . . . . . 1105.4 Location of . . . . . . . . . . . . . . . . . . . . . . . 1104.2, 1105.0 Refrigeration recovery . . . . . . . . . . . . . . . . . . . . . 1101.2 Supports and anchorage. . . . . . . . . . . . . . . . . . . 1105.2 Testing of . . . . . . . . . . . . . . . . . . . . 1116.0, Table 1116.2 Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (see Valves,

for refrigeration systems) REFRIGERATION

MACHINERY ROOMS . . . . . . . . . . . 220.0, 1106.0, 1115.3 REFRIGERATION SPACES

Concentration limit. . . . . . . 1102.3, 1104.2, Table 1102.3 Industrial occupancies. . . . . . . . . . . . . . . . . . . . . 1104.4 Institutional occupancies . . . . . . . . . . . . . . . . . . . 1104.3 Nonconnecting spaces . . . . . . . . . . . . . . . . . . . 1104.2.2 Refrigerated spaces . . . . . . . . . . . . . . . . . . . . . . 1104.4 Ventilated spaces . . . . . . . . . . . . . . . . . . . . . . . 1104.2.3 Volume calculation . . . . . . . . . . . . . . . . . . . . . . 1104.2.1 REFRIGERATION SYSTEM CLASSIFICATION

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220.0 High-probability systems. . . . . . . . . . . . . . . . . . 1103.2.1 Higher flammability refrigerants. . . . . . . . . . . . . . 1103.3 Low-probability . . . . . . . . . . . . . . . . . . . . . . . . . 1103.2.2 REFRIGERATION SYSTEMS

Absorption . . . . . . . . . . . . . . . . . . . . . . . . . 220.0, 307.4 Appliances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 934.0 Attic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1105.3, 1105.9 Classification of . . . . . . . . . . . . . . . . . . . . . . . . . . 1103.2 Condensation . . . . . . . . . . . . . . . . . . . . . . 310.6, 1105.7,

1105.10, 1109.9 Containing hazardous fluids . . . . . . . . . . . . . . . . 1125.0 Defrost. . . . . . . . . . . . . . . . . . . . . . . . . . 1105.8, 1105.10 Discharge piping. . . . . . . . . . . . 1112.10, 1112.11, 1114.1 Duct furnaces used with . . . . . . . . . . . . . . . . . . . . 905.6 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1108.2 Emergency shut-off . . . . . . . . . . . . . . . . . . . . . . . 1108.3 Flaring device . . . . . . . . . . . . . . . . . . . . . 1114.1–1114.3 High probability. . . . . . . . . . . . . . . . . . . . . . . . . 1103.2.1 Highside, definition . . . . . . . . . . . . . . . . . . . . . . . . 210.0 Human comfort . . . . . . . . . . . . . . . . . . . . . . . . . . 1105.1 Labeling. . . . . . . . . . . . . . . . . . . . . . 307.3, 307.4, 1115.3 Low probability . . . . . . . . . . . . . . . . . . . . . . . . . 1103.2.2 Lowside, definition. . . . . . . . . . . . . . . . . . . . . . . . . 214.0 Machinery room. . . . . . . . . . . . . . . . . . . . 220.0, 1106.0,

. . . . . . . . . . . . . . . 210.0 Human comfort . . . . . . . . . . . . . . . . . . . . . . . . . . 1105.1 Labeling. . . . . . . . . . . . . . . . . . . . . . 307.3, 307.4, 1115.3 Low probability . . . . . . . . . . . . . . . . . . . . . . . . . 1103.2.2 Lowside, definition. . . . . . . . . . . . . . . . . . . . . . . . . 214.0 Machinery room. . . . . . . . . . . . . . . . . . . . 220.0, 1106.0,

1107.0, 1115.3 Maintenance and operation . . . . . . . . . . . . . . . . . 1118.0 Mechanical. . . . . . . . . . . . . . . . . . . . . . . . . 220.0, 934.3 Mechanical system, definition . . . . . . . . . . . . . . . . 220.0 Mechanical ventilation . . . . . . . . . . . . . . . . . . . . . 1107.0 Permissible . . . . . . . . . . . . . . . . . . . . . . . . Table 1104.1

Pressure-limiting devices . . . . . . . . . . . . . . . . . . . 1111.0 Pressure-relief devices . . . . . . . . . . . . . . 1112.0, 1112.9,

1112.10, 1112.11 1113.4, 1113.5, 1115.4, Table 1113.5 Probability . . . . . . . . . . . . . . . 1103.2, 1103.2.1, 1103.2.2 Protection from

mechanical damage . . . . . . . . . . . . . . . . . . . 1109.4.1 Requirements for . . . . . . . . . . . . . . . . . . . . . . . . . 1104.0 Self-contained mechanical

refrigeration systems . . . . . . . . . . . . . . . . . . . . . 934.3 Self-contained refrigerators

and freezers . . . . . . . . . . . . . . . . . . . . . . . . . . . 934.1 Unit coolers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 934.2 Ventilation of room . . . . . . . . . . . . . . . . . . 1105.5, 1107.0 REFRIGERATORS

Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 928.0 Factory-built . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 934.1 Ventilating kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 928.2 REGULATOR VENT PIPING . . . . . . . . . . . . . . . . 1308.5.4.1 REGULATORS

Combustion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1009.0 Gas appliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . 924.5 Gas-pressure regulators . . . . . . . . . . . . . . . . . . . 1007.0 Vent piping . . . . . . . . . . . . . . . . . . . . . . . . . . 1308.5.4.1 RISER HEAT PIPE

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220.0 ROOFTOP TERMINATIONS

Chimneys. . . . . . . . . . . . . . . . . . . . . . . 802.5.4, 802.7.2,

803.1.10, 803.2.20 Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 511.1.3.1 Gas vents . . . . . . . . . . . . . . . . . . . . . . 802.6.1, 802.7.2,

803.1.10, 803.2.20 ROOM HEATERS . . . . . . . . . . . . . . . . . . . . . . . 220.0, 916.0 ROOM

Airborne infection isolations . . . . . . . . . . . . . . . . . 414.0 Bathroom and laundry . . . . . . . . . . . . . . . . . . . . . 504.6 Boiler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0, 303.2,

412.0, 1001.2, 1001.4 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412.0 Equipment . . . . . . . . . . . . . . . . . . . . . . . . 303.2, 305.1.3 HPM storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210.0 Machinery. . . . . . . . . . . . . . . . . . . . . . . . 1106.0, 1107.0,

1108.0, 1115.3 Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412.0 Odorous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413.0 Protective environment . . . . . . . . . . . . . . . . . . . . . 415.0 Used for ventilation . . . . . . . . . . . . . . . . . . . . . . 402.2.2 RUPTURE MEMBERS . . . . . . . . . . . . . . . 220.0, 1112.10.1,

1112.11.1, 1112.13, 1113.3, 1115.4.1

– S – SEDIMENT TRAPS . . . . . . . . . . . . . . . . . . 1310.8.2, 1312.9 SEEPAGE PAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 906.9 SELF-CONTAINED . . . . . . . . . . . . . . . . . . . . . 221.0, 517.1.2

2019 CALIFORNIA MECHANICAL CODE 503

INDEX any other purpose or distributed to any other persons or parti es.

SHAFT

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221.0 Fuel gas piping. . . . . . . . . . . . . . . . . . . . . . . . . 1310.2.3 Refrigeration systems . . . . . . . . . . . . . . 305.3, 1109.4.1 Ventilation system . . . . . . . . . . . . . . . . . . . . E 503.4.6.4 SHAFT ENCLOSURE

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221.0 SHUTOFF

Automatic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 608.0 Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 513.4, 513.9,

C 102.0, Table 1003.2.1 SMOKE DAMPERS . . . . . . . . . . . . . . . . . . . . . 206.0, 605.0 SMOKE DETECTORS . . . . . . . . . . . . . . . . . . . 221.0, 608.0 SNOWMELT SYSTEMS . . . . . . . . . . . . . . 1220.2, 1220.2.1,

1217.5.2, Table 1220.2.1 SOLAR ENERGY SYSTEMS . . . . . . . . . . . . . . . . . . . 1502.0. SOLID-FUEL

Boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1002.4 Burning appliances . . . . . . . . . . . . . . . . . . . . . . . 902.10 Chimney, combination

gas- and solid-fuel. . . . . . . . . . . . . . . . . . . . 802.5.8.2 Furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 904.11 Room heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 916.3 Venting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 801.3 SPARK ARRESTERS

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221.0 Solid-cooking operations. . . . . . . . . . . . . . . . . . . 517.1.6 SPECIFIC APPLIANCES,

INSTALLATION OF . . . . . . . . . . . . . . . . . . . . . . Chapter 9 STANDARDS

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221.0 General . . . . . . . . . . . . . . . . . . . . . . . . . . 301.2, 302.1.2 Fire-extinguishing systems. . . . . . . . . . . . . . . . . 513.2.2 Fuel gas piping. . . . . . . . . . . . . . . . . . . . . . . . . . D 115.1 Hydronics . . . . . . . . . . . . . 1203.2, 1207.3, Table 1210.1 Oil-or liquid-fuel

burning equipment. . . . . . . . . . . . . . . . . . . . . C 103.0 Referenced. . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 17 Steam and hot water boilers . . . . . . . . . . . . . . . . 1002.0 STATIONARY

Engine generators. . . . . . . . . . . . . . . . . . . . . . . . 1602.0 Fuel Cell Power Plant . . . . . . . . . . . . . . . . 221.0, 1601.0 Gas Engines . . . . . . . . . . . . . . . . . . . . . . . . . . . .1602.0 STEAM AND HOT-WATER SYSTEMS . . . . . . . . . . . . . .319.0 SUPPORT AND HANGERS . . . . . . . . . .313.0, Table 313.3 SUSTAINABLE PRACTICES . . . . . . . . . . . . . . .Appendix E SWITCHES, ELECTRICAL SUPPLY LINE . . . . . . .903.2.7

– T – TANKLESS WATER HEATERS . . . . . . . . . . . . . . . . .1203.3 TERMINATION

Chimneys . . . . . . . . . . . . . . . . . . . . .802.5.4, 802.5.4.2 Environmental air ducts . . . . . . . . . . . . . . . . . . .502.2.1 Exhaust duct systems,

commercial kitchen . . . . . . . . . . . . . . . . .510.9, 519.5

Exhaust

ducts, clothes dryer . . . . . . . . . . . . . . . . . . . . . .504.4 Gas vents . . . . . . . . . . . . . . . . . . . . . . . .802.6, 802.6.1,

802.6.1.3, 802.6.1.4, 802.7.2, 802.8, 802.8.2 Product conveying ducts . . . . . . . . . . . . . . . . . .502.2.2 Type I hood exhaust system . . . . . . . . . . . . . . . . .510.9 Type II hood exhaust system . . . . . . . . . . . . . . . . .519.5 TESTING

Of boilers . . . . . . . . . . . . . . . . . . . . . . . . .1012.1, 1013.0 Of ducts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .602.2 Of exhaust systems . . . . . . . . . . . . . . . . . . . . . . . .514.0 Of fuel-gas piping . . . . . . . . . . . . . . . . . . .105.3, 1313.0 Of hood assemblies . . . . . . . . . . . . . . . . . . . . . . .508.2 Of insulating materials . . . . . . . . . . . . . .508.3.4, 602.2 Of louvers . . . . . . . . . . . . . . . . . . . . . . .315.1.1, 315.1.2 Of recirculating systems . . . . . . . . . . .516.2.2, 516.2.5,

516.6.4 Of refrigerating equipment . . . . . . . . . . . .105.3, 1114.3,

1116.0 Of safety interlocks . . . . . . . . . . . . . . . . . . . . . . .516.6.4 Required by the Authority

Having Jurisdiction . . . . . . . . . . . . . . . . . . . . .302.2.1 TESTING AGENCY

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222.0 TESTING AND BALANCING . . . . . . . . . . . . . . . . . . . . . 417.0 THERMAL RECOVERY UNIT

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222.0 TOILETS, GAS FIRED . . . . . . . . . . . . . .929.0, Table 802.4 TYPES OF

Chimneys . . . . . . . . . . . . . . . . . . . . . . . .(see Chimney)

– U – UMC

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223.0 UNCONSTITUTIONAL . . . . . . . . . . . . . . . . . . . . . . . . .101.4 UNDER-FLOOR SPACE . . . . . . . . . . . . . . . . . .304.4, 607.0 UNIT HEATER . . . . . . . . . . . . . . . . . . . . . . . . .223.0, 917.0,

Table E 503.7.1(5) UNSAFE EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . .102.5 UNUSUALLY TIGHT CONSTRUCTION

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223.0

– V – VALIDITY OF PERMITS . . . . . . . . . . . . . . . . . . . . . .104.4.2 VALVE TYPES

Bleed lines for diaphragm-type . . . . . . . . . . . . . .902.16 Companion or block, definition . . . . . . . . . . . . . . .224.0 Pressure relief . . . . . . . . . . . . . . . . . . . . . .224.0, 904.6,

927.3, 1112.0, 1113.0, 1115.4, C 109.1 Safety or relief . . . . . . . . . . . . .1005.0, 1009.0, C 109.1 Shutoff . . . . . . . . . .904.6, 1006.0, 1308.12, 1310.9.1.1,

1310.11, 1312.3.1, 1312.3.2, 1312.5.3, 1312.6, 1406.2.1.5, C 109.1, D 103.0, D 104.3,

D 110.4, D 112.3

504 2019 CALIFORNIA MECHANICAL CODE

INDEX

Stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . .224.0, 1112.6 VALVES

For fuel gas piping . . . . . . . . . . . .1308.5.1, 1308.5.8.4,

1308.10.1, 1308.12, 1309.1, 1310.2.2.1, 1310.9.1.1, 1310.11, 1310.14.6, 1312.3.1, 1312.3.2, 1312.5.3, 1312.6, 1312.9, 1313.1.4, 1313.1.5, D 103.0, D 104.3, D 110.4,

D 112.3, D 113.3

For hydronics . . . . . . . . . . . . . . . . . . . . . . . . . . . .1212.0 For mobile home parks . . . .D 103.0, D 104.3, D 110.4,

D 112.3, D 113.3 For recreational vehicle park . . . . . . .D 103.0, D 104.3,

D 110.4, D 112.3, D 113.3 For refrigeration systems . . . . . . . . . . . .1105.3, 1109.0,

1110.0, 1112.6, 1112.9, 1113.6 VENT

Appliances not requiring vents . . . . . . . . . . . . . .802.2.1 Caps . . . . . . . . . . . . . . . . . . . . . . . .802.6.1.5, 802.7.4.3 Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . .802.7.3.4,

Table 303.10.1,

Table 802.7.3.3 Dampers . . . . . . . . . . . . . . . . .802.13, 802.15, 802.15.1 Direct vent . . . . . . . . . . . . . . . . . . . . . . . . . . . . .802.2.6 General requirements . . . . . . . . . . . . . . . . . . . . . .802.0 Insulation shield . . . . . . . . . . . . . . . . . . . . . . . .802.6.1.7 Integral . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .802.2.7 Listing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .802.1 Mechanical draft . . . . . . . . . . . . . . . .802.3.3–802.3.3.5 Obstruction of flow . . . . . . . . . . . . . . . . . . . . . . .802.14 Plastic piping . . . . . . . . . . . . . . . . . . . . . . . . . . .802.4.1 Special . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .802.4.3 Termination . . . . . . . . . . . . . . . . . . . .802.6.1–802.6.1.6,

802.7.2, 802.8 Wall penetration . . . . . . . . . . . . . . . . . . . . . . . . . .802.8 VENT, ATTIC . . . . . . . . . . . . . . . . . . .802.10.1.1, 802.10.1.2 VENT, GAS . . . . . . . . . . . . . . .224.0, 802.4, 802.6, 802.6.2,

802.6.2.1, 802.6.2.2 VENT, GAS CONNECTORS . . . . . . . . . . .(see Connectors,

gas vent) VENT DAMPERS . . . . . . . . . . . . . . . . . . . . .(see Dampers) VENT SIZING

Category I appliances . . . . . . . . . . . . .802.6.2.1, 803.0 Multiple appliances . . . . . . . . . . . . . . . . . . . . . . .803.2,

Table 803.2(1)–Table 803.2(9) Multistory . . . . . . . . . . . . . . . . . . . . .802.6.3, 802.6.3.2,

803.2.16 Single appliance . . . . . . . .802.7.4.1, 802.10.2.1, 803.1,

Table 803.1.2(1)–Table 803.1.2(6) VENTED

Decorative appliances . . . . . . . . . . . . . . . .224.0, 911.0,

Table 802.4, Table 911.2

Equipment not

required to be . . . . . . . . . . . . . . . . . . . . . . . . .802.2.1 Fireplaces . . . . . . . . . . . . . .912.0, E 602.0, Table 911.2,

Table 1308.4.1 Wall furnace . . . . . . . . . . . . . .224.0, 907.1, Table 802.4 VENTED APPLIANCE CATEGORIES

Category I . . . . . . . . . . . . . . . . . . . . . . . .224.0, 701.1.1,

802.6.2.1, 802.6.3, 802.9.1, 802.10, 802.10.1.1, 802.10.3.2, 803.0, Appendix F, Table 802.4, Table 803.1.2(1)–Table 803.1.2(4),

Table 803.2(1)–Table 803.2(4) Category II . . . . . . . . . . . . . . . . . . . . .224.0, 802.6.2.3,

802.9, 802.11, Table 802.4 Category III . . . . . . . . . . . . . . . . . . . . .224.0, 802.6.2.3,

802.9.1, Table 802.4 Category IV. . . . . . . . . . . . . . . . . . . . . 224.0, 802.6.2.3,

802.9, 802.11, Table 802.4 VENTILATED SPACES . . . . . . . . . . . . . . . . . . . . . . 802.2.5 VENTILATING

Ceiling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224.0, 606.0 Equipment . . . . . . . . . . . . . . . . . . . . . . 513.4.2, 514.1.2 Hoods . . . . . . . . . . . . . . . . . . . . . . . . . 802.2.4, 802.3.4,

920.4.2, 922.3 Kits for use in refrigerators . . . . . . . . . . . . . . . . . . 928.2 Laboratory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 410.0 Portable, equipment, definition . . . . . . . . . . . . . . . 218.0 Requirements . . . . . . . . . . . . . . . . . . . . 418.3, Table 4-A VENTILATION

Air class and recirculation. . . . . . . . . . . . . . . . . . . 403.9 Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407.0 Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402.2 Multiple zone systems. . . . . . . . . . . . . . . . . . . . . . 404.0 Natural . . . . . . . . . . . . . . . . . . 402.2, 402.2.1, E 605.1.1 Obstructions of . . . . . . . . . . . . . . . . . . . . . . . . . . 802.14 Parking garages . . . . . . . . . . . . . . . . . . 403.7.1, 403.7.2 Rates . . . . . . . . . . . . . . . . . . . . . . . . 403.0, Table 402.1 VENTILATORS, HEAT

(ENERGY) RECOVERY . . . . . . . . . . . . . . . . 210.0, 504.5 VENTING COLLAR

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224.0 VENTING SELECTION TABLES

Exterior masonry chimney. . . . . . . . . . Table 803.1.2(6),

Table 803.2(6),

Table 803.2(7), Table 803.2(8),

Table 803.2(9) Masonry Chimneys . . . . . . . . . . . . . . . Table 803.1.2(3),

Table 803.1.2(4),

Table 803.2(3),

Table 803.2(4) Single appliances . . . Table 803.1.2(1)–Table 803.1.2(6) Single-wall metal

pipe or type B

asbestos cement vent . . . . . . . . . . Table 803.1.2(5),

Table 803.2(5)

2019 CALIFORNIA MECHANICAL CODE 505

any other purpose or distributed to any other persons or parti es.

Two or more

appliances . . . . . . . . . Table 803.2(1)–Table 803.2(9) Type B double-wall

gas vent . . . . . . . . . . . . . . . . . . . . . . Table 803.1.2(1),

Table 803.1.2(2),

Table 803.2(1),

Table 803.2(2) VIBRATION ISOLATORS . . . . . . . . . . . . . . . . . 602.7, 1001.5 VOLUME DAMPERS

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206.0

– W – WALL

Furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 907.0 Furnace, vented, definition . . . . . . . . . . . . . . . . . . 224.0 Heater, definition. . . . . . . . . . . . . . . . . . . . . . . . . . 225.0 Terminations . . . . . . . . . . . . . . . . . . . 510.9.2, 802.6.1.3 WARM AIR FURNACE

Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225.0 Heating systems . . . . . . . . . . . . . . . . . . . . . . . . . . 311.0 Located in under-floor spaces . . . . . . . . . . . . . . . . 607.0 WATER HEATERS

Accepted standards . . . . . . . . . . . . . . . . 1203.2, 1207.3,

Table 1203.2 Drain pans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305.4 Dual purpose . . . . . . . . . . . . . . . . . . . . . 1203.2, 1207.3,

Table 1203.2 For space heating

and cooling . . . . . . . . . . . . . . . . 1203.2, Table 1203.2 Tankless . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1203.3 WELD, CONTINUOUS

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .205.0 Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . .212.0, 1211.12 Pressure Vessels . . . . . . . . . . . . . . . . . . . . . . . . .1003.5 Welded duct connections . . . . . . . . . . . . . . . .510.5.3.2 WORKMANSHIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . .309.0

506 2019 CALIFORNIA MECHANICAL CODE

HISTORY NOTE APPENDIX

CALIFORNIA MECHANICAL CODE (TITLE 24, PART 4, CALIFORNIA CODE OF REGULATIONS)

For prior code history, see the History Note Appendix to the California Mechanical Code, 2016 Triennial Edition, effec- tive January 1, 2017.

1. (BSC 03/18, HCD 01/18, DSA-SS 03/18, OSHPD 04/18, SFM 04/18) Adoption by reference of the 2018 Uniform Mechanical Code with necessary amendments to become the 2019 California Mechanical Code, and repeal of the 2015 edition of the Uniform Mechanical Code; effective on January 1, 2020.

2019 CALIFORNIA MECHANICAL CODE 507

508 2019 CALIFORNIA MECHANICAL CODE

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Contents — California Mechanical Code (Title 24, Part 4)

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