Materials & fabrication

Grounded in the retrieved California Mechanical Code — click a citation to read the verbatim passage:

• CMC § 2.25 High relevance — show source text

  00|2.25|0.70|DR|3.70|1.05|DR|DR| |Minimum 33
  mil steel
  furring or
  minimum
  1x wood
  furringc|33 mil cold-
  formed steel
  stud|#10 screw|Steel thick-
  ness plus 3
  threads|16|3.85|1.45|DR|DR|3.40|DR|DR|DR| |Minimum 33
  mil steel
  furring or
  minimum
  1x wood
  furringc|33 mil cold-
  formed steel
  stud|#10 screw|Steel thick-
  ness plus 3
  threads|24|3.40|DR|DR|DR|2.70|DR|DR|DR| |Minimum 33
  mil steel
  furring or
  minimum
  1x wood
  furringc|43 mil or
  thicker cold-
  formed steel
  stud|#8 Screw|Steel thick-
  ness plus 3
  threads|12|3.00|1.80|DR|DR|3.00|0.65|DR|DR| |Minimum 33
  mil steel
  furring or
  minimum
  1x wood
  furringc|43 mil or
  thicker cold-
  formed steel
  stud|#8 Screw|Steel thick-
  ness plus 3
  threads|16|3.00|1.00|DR|DR|2.85|DR|DR|DR| |Minimum 33
  mil steel
  furring or
  minimum
  1x wood
  furringc|43 mil or
  thicker cold-
  formed steel
  stud|#8 Screw|Steel thick-
  ness plus 3
  threads|24|2.85|DR|DR|DR|2.20|DR|DR|DR| |Minimum 33
  mil steel
  furring or
  minimum
  1x wood
  furringc|43 mil or
  thicker cold-
  formed steel
  stud|#10 screw|Steel thick-
  ness plus 3
  threads|12|4.00|3.85|2.80|1.80|4.00|3.05|1.50|DR| |Minimum 33
  mil steel
  furring or
  minimum
  1x wood
  furringc|43 mil or
  thicker cold-
  formed steel
  stud|#10 screw|Steel thick-
  ness plus 3
  threads|16|4.00|3.30|1.95|0.60|4.00|2.25|DR|DR| |Minimum 33
  mil steel
  furring or
  minimum
  1x wood
  furringc|43 mil or
  thicker cold-
  formed steel
  stud|#10 screw|Steel thick-
  ness plus 3
  threads|24|4.00|2.25|DR|DR|4.00|0.65|DR|DR| |For SI: 1 inch = 25.4 mm, 1 pound per square foot (psf) = 0.0479 kPa, 1 pound per square inch = 0.00689 MPa.
  DR = Design Required, o.c. = on center.
  a. Wood furring shall be spruce-pine-fir or any softwood species with a specific gravity of 0.42 or greater.

• CMC § 4-46 Medium relevance — show source text

  4-46 2025 CALIFORNIA BUILDING CODE

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  SPECIAL DETAILED REQUIREMENTS BASED ON OCCUPANCY AND USE

  [F] 415.11.1.8 Electrical. Electrical equipment and devices within the fabrication area shall comply with the California Electri- cal Code. The requirements for hazardous locations need not be applied where the average air change is not less than four times that set forth in Section 415.11.1.6 and where the number of air changes at any location is not less than three times that required by Section 415.11.1.6. The use of recirculated air shall be permitted.

  [F] 415.11.1.8.1 Workstations. Workstations shall not be energized without adequate exhaust ventilation. See Section 415.11.1.6 for workstation exhaust ventilation requirements.

  [F] 415.11.2 Corridors. Corridors shall comply with Chapter 10 and shall be separated from fabrication areas as specified in Section 415.11.1.2. Corridors shall not contain HPM and shall not be used for transporting such materials except through closed piping systems as provided in Section 415.11.7.4.

  Exception: Where existing fabrication areas are altered or modified, HPM is allowed to be transported in existing corridors, subject to the following conditions:

  1. Nonproduction HPM is allowed to be transported in corridors if utilized for maintenance, lab work and testing.
  2. Where existing fabrication areas are altered or modified, HPM is allowed to be transported in existing corridors, subject to the following conditions: 2.1. Corridors. Corridors adjacent to the fabrication area where the alteration work is to be done shall comply with Section 1020 for a length determined as follows: 2.1.1. The length of the common wall of the corridor and the fabrication area; and 2.1.2. For the distance along the corridor to the point of entry of HPM into the corridor serving that fabrication area.

  2.2. Emergency alarm system. There shall be an emergency telephone system, a local manual alarm station or other approved alarm-initiating device within corridors at not more than 150-foot (45 720 mm) intervals and at each exit and doorway. The signal shall be relayed to an approved central, proprietary or remote station service or the emergency control station and shall initiate a local audible alarm. 2.3. Pass-throughs. Self-closing doors having a fire protection rating of not less than 1 hour shall separate passthroughs from existing corridors. Pass-throughs shall be constructed as required for the corridors and protected by an approved automatic sprinkler system.

  [F] 415.11.3 Service corridors. Service corridors within a Group H-5 occupancy shall comply with Sections 415.11.3.1 through 415.11.3.4.

  [F] 415.11.3.1 Use conditions. Service corridors shall be separated from corridors as required by Section 415.11.1.2. Service corridors shall not be used as a required corridor.

  [F] 415.11.3.2 Mechanical ventilation. Service corridors shall be mechanically ventilated as required by Section 415.11.1.6 or at not less than six air changes per hour.

• CMC § 08-15 Medium relevance — show source text

  063928 Overhead and Underground Panel Board Construction . . . . . . . . . . . . . . . . . . . . . . . OH: Services/UG−1: Services/Greenbook . . . . . 065374

  Table 1 List of Materials to be Furnished and Installed by the Customer

  Table	e 1 List of Materials to be Furnished and Installed by the Customer (see Figure 1 on Page 3 and Figure 3 on Page 4)
  Item	Description
  1	Service Termination Enclosure, Combination Meter Socket Panel (see Figure 2 on Page 3 or Figure 4 on Page 4 for details)
  2	Square Post, 6” x 6” x 8’-0” Long, Cylindrical Post, 6” in Diameter x 8’-0” Long, Fully Treated (see Note 4 on Page 1)
  3	Conduit (load side), Size and Material as Required by Building Code (typically rigid galvanized steel or Schedule 80 PVC plastic)
  4	Conduit, Service Riser, Rigid Steel, Galvanized or Schedule 80 PVC Plastic, (see Note 5 on Page 3)
  5	Conduit, Rigid Steel, Galvanized, With Pipe Strap (for bare ground wire, omit if armor clad wire is used)
  6	Hub and Clamp, Grounding, to Suit Item 5
  7	Ground Rod (see Note 6)
  8	Ground Wire, Copper, Bare or Armor Clad (size in accordance with applicable electrical codes and local requirements)
  9	Conduit, Plastic or Rigid Steel, for Underground Service (size as shown inDocument 063927 andDocument 063928)

  054712 Page 2 of 4 Rev. #09: 08-15-17

  UG-1: Services Greenbook Permanent Wood Post Installation Underground Electric Service EMWP

  Residential Service Only, 0−225 Amp

  Notes

  1. Poured concrete pad shall be approximately 4 inches thick. Provide 1/2-inch slope away from post to allow for drainage.

  2. Install bend in direction of service trench. To facilitate cable installation, only one 90 ° bend is permitted in the service riser installation. If trench is shared with gas or other utilities, consult PG&E for required increased trench depth.

• CMC § 04-15 Medium relevance — show source text

  . . . . . . . . . 063928

  Table	1 Description of Items to be Furnished and Installed by Customer
  Item	Description
  1	Option 1: Meter Adapter, Cooper B-Line Cat. No. MARR20L45GRSD (160A) Use with Customer’s Panel Rated at 160A Continuous1, 2
  1	Option 2: Meter Adapter, Ekstrom Industries No. 722B (175A). Specify Left, Right, or Bottom Hub
  2	Combination Service Meter and Breaker Panel (rating as required)
  3	Pull Termination Box, 8” x 12” x 4”, Rain-Tight, Circle A-W (Cooper B-Line) No. R-9007A or Equivalent (see Note 4M on Page 2)
  4	Conduit, See Notes 4C and 4G on Page 1
  5	Hub to Be Closed and Made Tamper Proof
  6	Pull Termination Box, 12” x 26” x 6”, Rain-Tight, Circle A-W Catalog Number R-90008, or Equivalent (see Note 4K on Page 2)

  1 Fifth jaw accessory, use Cooper B-Line Cat. No. 50365. 2 Reducer hub and gasket accessories for 2” conduit, use Cooper B-Line Cat. No. AW200 and 12750A.

  061032 Page 2 of 4 Rev. #04: 04-15-11

  UG-1: Services Greenbook Residential and Small Commercial Overhead to Underground Electric Service Conversion

  Optional Removable by Customer To Be Removed by PG&E Meter Socket (see Figure 2 through Figure 7 on Pages 3 through 4) For Riser and Pull Box Detail (see Figure 2 through Figure 7 on Pages 3 through 4) For Gas and Water Sealing Requirements, see Documents 063927 and Document 063928 48” Min. 72” Max. Customer Shall Dig and Backfill Trench (see Note 4B on Page 1) Min. Bend Depth To PG&E Distribution System As required by	Col2	Col3
  Customer Shall Dig and Backfill Trench (see Note 4B on Page 1) For Riser and Pull Box Detail (see Figure 2 through Figure 7 on Pages 3 through 4) Meter Socket (see Figure 2 through Figure 7 on Pages 3 through 4) To Be Removed by PG&E For Gas and Water Sealing Requirements, seeDocuments 063927 andDocument 063928 To PG&E Distribution System Optional Removable by Customer 48” Min. 72” Max. As required by Min. Bend Depth

  Document 063927 and Document 063928

  Figure 1 Typical Service Conversion

  PG&E Service Termination Point

  See Note 4K on Page 2

  PG&E Service Termination Point (see Note 4L on Page 2)

• CMC § 120.4 Medium relevance — show source text

  Nonresidential and hotel/motel buildings shall comply with the applicable requirements of Sections 120.4(a) through 120.4(g).

  Exception to Section 120.4: Systems serving healthcare facilities shall comply with the applicable requirements of the California Mechanical Code.

  (a) CMC compliance. All air distribution system ducts and plenums, including but not limited to building cavities, mechanical closets, air-handler boxes and support platforms used as ducts or plenums, shall meet the requirements of the CMC Sections 601.0, 602.0, 603.0, 604.0, and 605.0, and ANSI/SMACNA-006-2006 HVAC Duct Construction Standards Metal and Flexible, 3rd Edition incorporated herein by reference. Connections of metal ducts and the inner core of flexible ducts shall be mechanically fastened. Openings shall be sealed with mastic, tape, aerosol sealant or other duct-closure system that meets the applicable requirements of UL 181, UL 181A, or UL 181B. If mastic or tape is used to seal openings greater than [1] / 4 inch, the combination of mastic and either mesh or tape shall be used.

  Portions of supply-air and return-air ducts conveying heated or cooled air located in one or more of the following spaces shall be insulated to a minimum installed level of R-8:

  1. Outdoors; or

  2. In a space between the roof and an insulated ceiling; or

  3. In a space directly under a roof with fixed vents or openings to the outside or unconditioned spaces; or

  4. In an unconditioned crawlspace; or

  5. In other unconditioned spaces.

  2025 CALIFORNIA ENERGY CODE 77

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  NONRESIDENTIAL, HOTEL/MOTEL OCCUPANCIES, AND COVERED PROCESSES—MANDATORY REQUIREMENTS

  Portions of supply-air ducts that are not in one of these spaces, including ducts buried in concrete slab, shall be insulated to a minimum installed level of R-4.2 or be enclosed in directly conditioned space.

  (b) Duct and plenum materials.

  1. Factory-fabricated duct systems. A. All factory-fabricated duct systems shall comply with UL 181 for ducts and closure systems, including collars, connections and splices, and be labeled as complying with UL 181. UL 181 testing may be performed by UL laboratories or a laboratory approved by the Executive Director. B. All pressure-sensitive tapes, heat-activated tapes, and mastics used in the manufacture of rigid fiberglass ducts shall comply with UL 181 and UL 181A. C. All pressure-sensitive tapes and mastics used with flexible ducts shall comply with UL 181 and UL 181B. D. All ductwork and plenums with pressure class ratings shall be constructed to Seal Class A. Joints and seams of duct systems and their components shall not be sealed with cloth-back rubber adhesive duct tapes unless such tape is used in combination with mastic and drawbands.

  Exception to Section 120.4(b)1D: Ductwork located in occupied space and exposed to view is not required to meet Seal Class A.

• CMC § 25.4 Medium relevance — show source text

  For SI units: 1 inch = 25.4 mm

  FIGURE 1312.9

  METHOD OF INSTALLING A TEE FITTING SEDIMENT TRAP

  [NFPA 54: FIGURE 9.6.8]

  1312.10 Installation of Piping. Piping shall be installed in a manner not to interfere with inspection, maintenance, or servicing of the appliances. [NFPA 54:9.6.9] 1312.11 Liquefied Petroleum Gas (LP-Gas) Facilities and Piping. Liquefied petroleum gas (LP-Gas) facilities shall comply with NFPA 58.

  1313.0 Pressure Testing, Inspection, and Purging. 1313.1 Piping Installations. Prior to acceptance and initial operation, all piping installations shall be visually inspected and pressure tested to determine that the materials, design, fabrication, and installation practices comply with the requirements of this code. [NFPA 54:8.1.1.1] 1313.1.1 Inspection Requirements. Inspection shall consist of visual examination, during or after manufacture, fabrication, assembly, or pressure tests. [NFPA 54:8.1.1.2] 1313.1.2 Repairs and Additions. Where repairs or additions are made following the pressure test, the affected piping shall be tested. Minor repairs and additions are not required to be pressure tested, provided that the work is inspected and connections are tested with a noncorrosive leak-detecting fluid or other leak-detecting methods approved by the Authority Having Jurisdiction.

  [NFPA 54:8.1.1.3]

  1313.1.3 New Branches. Where new branches are installed to new appliance(s), only the newly installed branch(es) shall be required to be pressure tested. Connections between the new piping and the existing piping shall be tested with a noncorrosive leak-detecting fluid or approved leak-detecting methods. [NFPA 54:8.1.1.4] 1313.1.4 Piping System. A piping system shall be tested as a complete unit or in sections. Under no circumstances shall a valve in a line be used as a bulkhead between gas in one section of the piping system and test medium in an adjacent section, unless a double block and bleed valve sys

  2025 CALIFORNIA MECHANICAL CODE 291

  ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

  FUEL GAS PIPING

  tem is installed. A valve shall not be subjected to the test pressure unless it can be determined that the valve, including the valve-closing mechanism, is designed to safely withstand the pressure. [NFPA 54:8.1.1.5]

  1313.1.5 Regulators and Valves. Regulator and valve assemblies fabricated independently of the piping system in which they are to be installed shall be permitted to be tested with inert gas or air at the time of fabrication. [NFPA 54:8.1.1.6]

  1313.1.6 Test Medium. The test medium shall be air, nitrogen, carbon dioxide, or an inert gas. Oxygen shall not be used as a test medium. [NFPA 54:8.1.2]

• CMC § 602.2 Medium relevance — show source text

  [Not permitted for OSHPD 1, 1R, 2, 3, 4 & 5] Concealed building spaces or independent construction within buildings shall be permitted to be used as ducts or plenums. Gypsum board shall not be used for positive pressure ducts.

  Exception: In healthcare facilities, concealed spaces shall not be permitted to be used as ducts or plenums.

  602.2 Combustibles Within Ducts or Plenums. Materials exposed within ducts or plenums shall be noncombustible or shall have a flame spread index not to exceed 25 and a smoke-developed index not to exceed 50, where tested as a composite product in accordance with ASTM E84 or UL 723. Plastic piping installed in plenums shall be tested in accordance with all requirements of ASTM E84 or UL 723. Mounting methods, supports and sample sizes of materials for testing that are not specified in ASTM E84 or UL 723 shall be prohibited.

  Exceptions:

  (1) Return-air and outside-air ducts, plenums, or concealed spaces that serve a dwelling unit.

  (2) Air filters in accordance with the requirements of Section 311.2.

  (3) Water evaporation media in an evaporative cooler.

  (4) Charcoal filters where protected with an approved fire suppression system.

  (5) Products listed and labeled for installation within plenums in accordance with Section 602.2.1 through Section 602.2.4.

  (6) Smoke detectors in accordance with the requirements of Section 609.0.

  (7) Duct insulation, coverings, and linings and other supplementary materials installed in accordance with Section 605.0.

  (8) Materials in a hazardous fabrication area including the areas above and below the fabrication area sharing a common air recirculation path with the fabrication area.

  (9) Plastic water distribution piping listed and labeled for use in plenums in accordance with UL 2846 as having a peak optical density not greater than 0.50, an average optical density not greater than 0.15, and a flame spread distance not greater than 5 feet (1524 mm), and installed in accordance with its listing, shall be permitted.

  602.2.1 Electrical. Electrical wiring in plenums shall comply with the California Electrical Code . Electrical wires and cables and optical fiber cables shall be listed and labeled for use in plenums and shall have a flame spread distance not exceeding 5 feet (1524 mm), an average optical density not exceeding 0.15, and a peak optical density not exceeding 0.5, where tested in accordance with NFPA 262.

  602.2.2 Fire Sprinkler Piping. Nonmetallic fire sprinkler piping in plenums shall be listed and labeled for use in plenums and shall have a flame spread distance not exceeding 5 feet (1524 mm), an average optical density not exceeding 0.15 and, a peak optical density not exceeding 0.5, where tested in accordance with UL 1887.

  602.2.3 Pneumatic Tubing. Nonmetallic pneumatic tubing in plenums shall be listed and labeled for use in plenums and shall have a flame spread distance not exceeding 5 feet (1524 mm), an average optical density not exceeding 0.15, and a peak optical density not exceeding 0.5, where tested in accordance with UL 1820.

• California Mechanical Code Medium relevance — show source text

  Required1| |2|Self-Contained, Bused Safety Socket Box| |3|Combination Meter and Current Transformer Cabinet
  (See Note 6 on Page 3)| |4|Main Switch of Service Equipment Enclosure| |5|Service Conduit, As Required| |6|UG Panel Board Construction (See Figures 5 − 6)| |7|OH Panel Board Construction (See Figures 7 − 8)| |8|Post (See Note 1 on Page 1)| |9|Conduit, Riser, Galvanized Rigid Steel, Continuous without Couplings| |10|Ground Rod (See Note 2 on Page 3)| |11|Ground Wire, Copper, Bare| |12|Ground Clamp (As Required) for Item 10| |13|Sealable Gutter| |14|Metal Myers Hub With Close Nipple| |15|Heavy Duty 2-Hole Pipe Strap Every 36”| |16|PVC Schedule 40, minimum| |17|Weatherhead| |18|PG&E-Approved, Customer-Owned Pole| |19|Termination Enclosure| |20|Plastic−to−Steel Adapter/Coupling| |21|Conduit, Bend, Galvanized Rigid Steel, Continuous without Couplings| |22|Service Conduit, Coupling, As Required| |23|Conduit, Bend, PVC, Continuous without Couplings|

  1 The pull box is required to be installed but may be exempt only at the discretion of the PG&E inspector.

  065374 Page 8 of 9 Rev. #15: 3/25/2022

  OH: Services UG-1: Services Overhead and Underground Panel Board Construction Greenbook EMWP

  Revision Notes

  Revision 15 has the following changes:

  1. Corrected Note1.B.(4) on Page 2, replacing the first word “Struts” with “Unistrut”.

  2. Corrected Note D.(3). on Page 2, requiring thru bolts, nuts, and washers for Unistrut fasteners.

  3. Corrected itle of Figure 7 on Page 6, describing the coupling as a Plastic-to-Steel Adapter/Coupling.

  Rev. #15: 3/25/2022 065374 Page 9 of 9

  Greenbook

  Prepared by: MZGD

  Purpose and Scope

  This document provides a list of PG&E-approved manufacturers of major materials for use in PG&E’s Electric Distribution System.

  Table 1 PG&E-Approved Electric Distribution Materials Manufacturers

  Material	Responsible Engineer	Approved Manufacturer
  Arresters	Miguel Plascencia	ABB, Siemens
  Barrier Posts	M.L. Thibault	Allwire
  Brackets, Overhead	Eduardo Sanchez	Aluma-Form, Chance, Joslyn, Kortick, MacLean
  Cable, Primary	Lisseth Villareal	Okonite, Prysmian, Southwire1
  Cable, Aluminum, Secondary	Lisseth Villareal	Prysmian (General Cable)1, Southwire
  Cable, Copper, Secondary	Lisseth Villareal	Okonite
  Capacitor Controls	Miguel Plascencia	HD Electric, S&C (Energyline)
  Capacitor, Overhead	Miguel Plascencia	ABB, Cooper
  Capacitor, Pad-Mounted	Miguel Plascencia	Scott Engineering
  Conduit,

• CMC § 04-15 Medium relevance — show source text

  . . . . . . . . . . . . . . . . . . . UG-1: Services/Greenbook . . . . . . . . . . . . . . . . . . 063927 Methods and Requirements for Installing Commercial Underground Electric Services 0−600 Volts to Customer-Owned Facilities . . . . . . . . . . . . . . . . . . . . UG-1: Services/Greenbook . . . . . . . . . . . . . . . . . . 063928

  Table	1 Description of Items to be Furnished and Installed by Customer
  Item	Description
  1	Option 1: Meter Adapter, Cooper B-Line Cat. No. MARR20L45GRSD (160A) Use with Customer’s Panel Rated at 160A Continuous1, 2
  1	Option 2: Meter Adapter, Ekstrom Industries No. 722B (175A). Specify Left, Right, or Bottom Hub
  2	Combination Service Meter and Breaker Panel (rating as required)
  3	Pull Termination Box, 8” x 12” x 4”, Rain-Tight, Circle A-W (Cooper B-Line) No. R-9007A or Equivalent (see Note 4M on Page 2)
  4	Conduit, See Notes 4C and 4G on Page 1
  5	Hub to Be Closed and Made Tamper Proof
  6	Pull Termination Box, 12” x 26” x 6”, Rain-Tight, Circle A-W Catalog Number R-90008, or Equivalent (see Note 4K on Page 2)

  1 Fifth jaw accessory, use Cooper B-Line Cat. No. 50365. 2 Reducer hub and gasket accessories for 2” conduit, use Cooper B-Line Cat. No. AW200 and 12750A.

  061032 Page 2 of 4 Rev. #04: 04-15-11

  UG-1: Services Greenbook Residential and Small Commercial Overhead to Underground Electric Service Conversion

• CMC § 2.875 Medium relevance — show source text

  Table 9 Data and Material Codes for PVC Swedge Reducers [1]

  Reducer Size (inches)	Dimensions (inches)	Col3	Col4	Col5	Material Code
  Reducer Size (inches)	Minimum Length	Minimum Length	Typical Belled End ID	Typical Belled End ID	Typical Belled End ID
  Reducer Size (inches)	A	B	C	D	D
  3 x 2	2.875	1.750	3.515	2.393	018585
  4 x 3	3.375	2.875	4.515	3.515	018584
  5 x 4	4.000	3.375	5.593	4.515	360777
  6 x 5	5.000	4.000	6.658	5.593	360778

  1 � Both belled ends must be chamferred 0.3 inches (min) by 45 .

  062288 Page 6 of 20 Rev. #20: 03−25−22

  UG-1: Conduits Greenbook Underground Conduits

  PVC and HDPE Conduit and Fittings (continue)

  Table 10 High Density Polyethylene (HDPE) Conduit Directional

  Figure 9 HDPE Conduit

  Figure 10 PE Mechanical Coupling

  Figure 11 PVC (Bore-Gard, Schedule 40

  Table 10 High Density Polyethylene (HDPE) Condu Boring Conduit 1	Col2	Col3	Col4	uit Directional	Col6
  Conduit	Conduit	Conduit	Conduit	Mechanical Couplings2, 3	Mechanical Couplings2, 3
  Size	Length (feet)	Description	Material Code	Size (inches)	Material Code
  2” Sch 80	500	Coil4	360511	2	360690
  2” Sch 80	40	Stick	360017	360017	360017
  3” Sch 80	500	Coil4	360644	3	360691
  3” Sch 80	40	Stick	360018	360018	360018
  4” Sch 80	625	Coil5	360014	4	360692
  4” Sch 80	40	Stick	360015	360015	360015
  5” SDR 13.5	450	Coil5	360012	5	360694
  5” SDR 13.5	40	Stick	360013	360013	360013
  6” SDR 13.5	450	Coil5	360010	6	360695
  6” SDR 13.5	40	Stick	360011	360011	360011

  1 Color must be black with at least 3 red longitudinal strips. 2 May be used to connect PE conduit to PVC conduit (except in directional drilling apps.) 3 Mechanical couplings are not designed for directional drilling. Fusion joints are required. 4 No reel. 5 With reel.

  Table 11 PVC (Bore-Gard) Directional Boring Conduit

• CMC § 603.13 Medium relevance — show source text

  603.13 Clearances. Duct clearances shall be in accordance with Section 603.13.1 through Section 603.13.6.

  603.13.1 General. Duct clearances to combustible construction shall be in accordance with the listing and the manufacturer’s installation instructions.

  603.13.2 Supply Air Ducts to Listed Furnaces. Supply air ducts connecting to listed central heating furnaces shall have the same minimum clearance to combustibles as required for the furnace supply plenum for a distance of not less than 3 feet (914 mm) from the supply plenum. Clearance shall not be required beyond the 3 feet (914 mm) distance. [NFPA 54:10.3.3.7] 603.13.3 Supply Air Ducts to Unlisted Furnaces. Supply air ducts connecting to unlisted central heating furnaces equipped with temperature limit controls with a maximum setting of 250°F (121°C) shall have a minimum clearance to combustibles of 6 inches (152 mm) for a distance of not less than 6 feet (1829 mm) from the furnace supply plenum. Clearance shall not be required beyond the 6 feet (1829 mm) distance. [NFPA 54:10.3.3.8]

  140 2025 CALIFORNIA MECHANICAL CODE

  ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

  DUCT SYSTEMS

  603.13.4 Furnace Plenums and Air Ducts. Where an air conditioner is installed within an enclosure, the installation shall comply with Section 604.4. [NFPA 54:10.2.6]

  603.13.5 Duct Furnaces. Duct furnaces shall be

  installed in accordance with Section 905.0.

  603.13.6 Fuel-Burning Kilns. A hood and duct serving a fuel-burning kiln shall have a clearance from combustible construction of not less than 18 inches (457 mm). This clearance shall be permitted to be reduced in accordance with Table 303.10.1.

  604.0 Furnace Plenums and Air Ducts Used in Fuel- Gas Appliances. 604.1 Furnace Plenums and Air Ducts. Furnace plenums and air ducts shall be installed in accordance with this Chapter, and NFPA 90A or NFPA 90B. {NFPA 54:10.3.8.1} 604.2 Supplied as a Part of Furnace. A furnace plenum supplied as a part of a furnace shall be installed in accordance with the manufacturer’s instructions. [NFPA 54:10.3.8.2] 604.3 Not Supplied with the Furnace. Where a furnace plenum is not supplied with the furnace, any fabrication and installation instructions provided by the manufacturer shall be followed. The method of connecting supply and return ducts shall facilitate proper circulation of air. [NFPA 54:10.3.8.3]

  604.4 Return Air. Where a furnace is installed so supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by a duct(s) sealed to the furnace casing and terminating outside the space containing the furnace. Return air shall not be taken from the mechanical room containing the furnace.

  [NFPA 54:10.3.8.4]

• CMC § 603.13.5 Medium relevance — show source text

  603.13.5 Duct Furnaces. Duct furnaces shall be

  installed in accordance with Section 905.0.

  603.13.6 Fuel-Burning Kilns. A hood and duct serving a fuel-burning kiln shall have a clearance from combustible construction of not less than 18 inches (457 mm). This clearance shall be permitted to be reduced in accordance with Table 303.10.1.

  604.0 Furnace Plenums and Air Ducts Used in Fuel- Gas Appliances. 604.1 Furnace Plenums and Air Ducts. Furnace plenums and air ducts shall be installed in accordance with this Chapter, and NFPA 90A or NFPA 90B. {NFPA 54:10.3.8.1} 604.2 Supplied as a Part of Furnace. A furnace plenum supplied as a part of a furnace shall be installed in accordance with the manufacturer’s instructions. [NFPA 54:10.3.8.2] 604.3 Not Supplied with the Furnace. Where a furnace plenum is not supplied with the furnace, any fabrication and installation instructions provided by the manufacturer shall be followed. The method of connecting supply and return ducts shall facilitate proper circulation of air. [NFPA 54:10.3.8.3]

  604.4 Return Air. Where a furnace is installed so supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by a duct(s) sealed to the furnace casing and terminating outside the space containing the furnace. Return air shall not be taken from the mechanical room containing the furnace.

  [NFPA 54:10.3.8.4]

  605.0 Insulation of Ducts.

  605.1 General. Air ducts conveying air at temperatures exceeding 140°F (60°C) shall be insulated to maintain an insulation surface temperature of not more than 140°F (60°C). Insulation material on the exterior of ducts shall be legibly printed with the name of the manufacturer, the thermal resistance (R) value at installed thickness, flame-spread index, and smoke developed index of the composite material. Internal duct liners and insulation shall be installed in accordance with

  SMACNA HVAC Duct Construction Standards – Metal and Flexible. [OSHPD 1, 1R, 2, 3, 4 & 5] Cold air ducts shall be insulated wherever necessary or to prevent condensation.

  Exceptions:

  (1) Factory-installed plenums, casings, or ductwork furnished as a part of HVAC equipment tested and rated in accordance with approved energy efficiency standards.

  (2) Ducts or plenums located in conditioned spaces where heat gain or heat loss will not increase energy use.

  (3) For runouts less than 10 feet (3048 mm) in length to air terminals or air outlets, the rated R-value of insulation need not exceed R-3.5.

  (4) Backs of air outlets and outlet plenums exposed to unconditioned or indirectly conditioned spaces with face areas exceeding 5 square feet (0.5 m [2] ) need not exceed R2; those 5 square feet (0.5 m [2] ) or smaller need not be insulated.

  (5) Ducts and plenums used exclusively for evaporative cooling systems.

  605.1.1 Within Ducts or Plenums. Materials installed