Indoor environmental quality, sound transmission and refrigerant/ozone-depleting substance controls

Grounded in the retrieved California Green Building Standards Code (CALGreen) — click a citation to read the verbatim passage:

• CALGreen § 903.2.5 High relevance — show source text

  903.2.5

  Ventilation 414.3, 415.9.1.7, 415.11.1.6, 415.11.1.8.1, 415.11.3.2, 415.11.6.8, 415.11.7.4, 415.11.8, 415.11.11, 1202.6 Weather protection 414.6.1 Hazardous Occupancy (Group H), (see Hazardous Materials) 307, 414, 415 Alarms and detection 415.11.2, 415.11.4, 415.11.6.9, 415.11.8, 415.3, 415.5, 907.2.5, 908.1, 908.2 Area 503, 505, 506, 507, 508 Dispersing 414.5, 414.6, 415.6 Gas detection systems 415.11.7 Group provisions H-1 (detonation) 307.3, 415.6.2, 415.7, 415.6.4.1, 415.7.1 H-2 (deflagration) 307.4, 415.8, 415.9 H-3 (physical hazard) 415.10, 307.5, 415.8 H-4 (health hazard) 307.6, 415.10 H-5 (semiconductor) 307.7, 415.11 Height 415.7, 415.8.1, 415.9.1.1, 426.1.1, 503, 504, 505, 506 Incidental uses 509

  Interior finishes 416.2.1, 416.3.1, Table 803.13, 804 Live load Table 1607.1

  Location on property 414.6.1.2, 415.6 Low hazard 306.3, 311.3 Means of egress Corridors 415.11.2 One means of egress Table 1006.3.4(1), Table 1006.3.4(2) Panic hardware 1006.2.2.2, 1006.2.2.3, 1006.2.2.4, 1010.2.8 Stairway, exit access 1019 Travel distance 1006.3, 1006.2.1, Table 1017.2

  Mixed occupancies 508.3, 508.4 Accessory 508.2 Moderate hazard 306.2, 311.2 Multiple hazards 306.2, 311.2 Occupancy exceptions 307.1 Plumbing fixtures Chapter 29 Risk category Table 1604.5 Separation from other occupancies 415.6.1, 508.1, 508.2.4, 508.3.3, 508.4 Smoke and heat removal 910.2 Special provisions based on materials Combustible liquids Table 307.1(1), 307.4, 307.5, 414.2.5, 414.5.3,

  415.9.2

  Corrosives 307.6, Table 414.2.5.1, 414.3, 415.10.3, Table 415.11.1.1 Explosives 307.3, 307.3.1, Table 415.6.5

• CALGreen § 90.1 Medium relevance — show source text

  (2) Systems serving zones where specific humidity levels are required, such as museums and hospitals, and approved by the Authority Having Jurisdiction or required by accreditation standards, and where humidistatic controls are capable of and configured to maintain a dead band of at least 10 percent relative humidity where no active humidification or dehumidification takes place.

  (3) Systems serving zones where humidity levels are required to be maintained with precision of not more than ±5 percent relative humidity to comply with applicable codes or accreditation standards or as approved by the Authority Having Jurisdiction.

  [ASHRAE 90.1:6.4.3.6.1]

  E 503.4.6.7.2 Humidification. Humidistatic controls shall not use fossil fuel or electricity to produce relative humidity above 30 percent in the warmest zone served by the system.

  Exceptions:

  (1) Systems serving zones where specific humidity levels are required, such as museums and hospitals, and approved by the Authority Having Jurisdiction or required by accreditation standards, and where humidistatic controls are capable of and configured to maintain a dead band of at least 10 percent relative humidity where no active humidification or dehumidification takes place.

  TABLE E 503.4.6.4.2 MAXIMUM DAMPER LEAKAGE [1, 2]

  (cubic foot per minute per square foot) at 1.0 inch water gauge

  [ASHRAE 90.1: TABLE 6.4.3.4.3]

  Col1	OUTDOOR AIR INTAKE (CFM/ft2)	Col3	EXHAUST/RELIEF (CFM/ft2)	Col5
  CLIMATE ZONE	NONMOTORIZED1	MOTORIZED	NONMOTORIZED3	MOTORIZED
  0, 1, 2	0, 1, 2	0, 1, 2	0, 1, 2	0, 1, 2
  Any height	20	4	20	4
  3	3	3	3	3
  Any height	20	10	20	10
  4, 5B, 5C	4, 5B, 5C	4, 5B, 5C	4, 5B, 5C	4, 5B, 5C
  Fewer than three stories	204	10	20	10
  Three or more stories	204	10	204	10
  5A, 6, 7, 8	5A, 6, 7, 8	5A, 6, 7, 8	5A, 6, 7, 8	5A, 6, 7, 8
  Fewer than three stories	204	4	20	4
  Three or more stories	204	4	204	4

• CALGreen § 4-66 Medium relevance — show source text

  451 Reserved. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-66

  452 School Facilities for Kindergarten Through 12th Grade and Group E Child Care. . . . . . . . . . . . . . . . . . . . . . . . .4-66

  453 Group L [SFM] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-67

  454 Reserved. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-70

  455 Large Family Day-Care Homes [SFM] . . . . . . . . . . . . . .4-70

  CHAPTER 5 GENERAL BUILDING HEIGHTS AND AREAS . . 5-1

  501 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

  502 Building Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

  503 General Building Height and Area Limitations . . . . . 5-3

  504 Building Height and Number of Stories . . . . . . . . . . . 5-4

  505 Mezzanines and Equipment Platforms. . . . . . . . . . . . 5-8

  506 Building Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9

  507 Unlimited Area Buildings. . . . . . . . . . . . . . . . . . . . . . . 5-13

  508 Mixed Use and Occupancy. . . . . . . . . . . . . . . . . . . . . . 5-15

  509 Incidental Uses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18

  510 Special Provisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19

  CHAPTER 6 TYPES OF CONSTRUCTION . . . . . . . . . . . . . . . 6-1

  601 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

  602 Construction Classification. . . . . . . . . . . . . . . . . . . . . . 6-3

  603 Combustible Material in Types I and II Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

  CHAPTER 7 FIRE AND SMOKE PROTECTION FEATURES. . 7-1

• CALGreen § 507.4.1.1 Medium relevance — show source text

  507.4.1.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Performance method|5.507.4.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Site features|5.507.4.2.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Documentation of compliance|5.507.4.2.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Interior sound transmission (with note)|5.507.4.3||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Ozone depletion and greenhouse gas reductions|5.508.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Chlorofluorocarbons (CFCs)|5.508.1.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Halons|5.508.1.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Supermarket refrigerant leak reduction for retail food
  stores 8,000 square feet or more|5.508.2
  through
  5.508.2.6.3||||| |||END OF MANDATORY PROVISIONS||||||

  Documentation Author's / Responsible Designer's Declaration Statement □ Mandatory: I attest that this mandatory provisions checklist is accurate and complete.	Col2
  Signature:	Signature:
  Company:	Date:
  Address:	License:
  City/State/Zip:	Phone:

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A5-47

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

  APPENDIX A5 — NONRESIDENTIAL VOLUNTARY MEASURES

  A5.602.1

  CALGreen VERIFICATION GUIDELINES

  TIER 1 CHECKLIST

  Application: This checklist shall be used for nonresidential projects that meet the following: new construction, or building additions of 1,000 square feet or greater, or building alterations with a permit valuation of $200,000 or more pursuant to Section 301.3, AND are adopting Tier 1 voluntary measures.

  Note: All applicable mandatory requirements in Chapter 5 shall be met prior to applying Tier 1 voluntary measures.

  Instructions:

  Comply with all Tier 1 prerequisite measures from the various categories shown on the table below.

  Add a “ Y ” to all mandatory and Tier 1 prerequisite measures in the appropriate columns.

  Select the required number of additional electives from those categories shown on the table below and add a “ Y ” on the selected elective and add an “ N ” on the rest.

• CALGreen § 90.1 Medium relevance — show source text

  [ASHRAE 90.1: TABLE 6.4.3.4.3]

  Col1	OUTDOOR AIR INTAKE (CFM/ft2)	Col3	EXHAUST/RELIEF (CFM/ft2)	Col5
  CLIMATE ZONE	NONMOTORIZED1	MOTORIZED	NONMOTORIZED3	MOTORIZED
  0, 1, 2	0, 1, 2	0, 1, 2	0, 1, 2	0, 1, 2
  Any height	20	4	20	4
  3	3	3	3	3
  Any height	20	10	20	10
  4, 5B, 5C	4, 5B, 5C	4, 5B, 5C	4, 5B, 5C	4, 5B, 5C
  Fewer than three stories	204	10	20	10
  Three or more stories	204	10	204	10
  5A, 6, 7, 8	5A, 6, 7, 8	5A, 6, 7, 8	5A, 6, 7, 8	5A, 6, 7, 8
  Fewer than three stories	204	4	20	4
  Three or more stories	204	4	204	4

  For SI units: 1 square foot = 0.0929 m [2], 1 cubic foot per minute = 0.00047 m [3] /s, 1 cubic foot per minute = 0.4719 L/s, 1 cubic foot per minute per square foot = 5.08 [(L/s)/m [2] ], 1 inch water gauge = 0.249 kPa

  Notes:

  1 When tested in accordance with AMCA 500D.

  2 Dampers smaller than 12 inches (305 mm) in height, width, or diameter need not be tested but shall be of the same design and construction as the smallest tested damper meeting the listed leakage rate requirement.

  3 Nonmotorized dampers smaller than 24 inches (610 mm) in height, width, or diameter shall be permitted to have a leakage rate of 40 CFM/ft 2 [0.203 (m 3 /s)/m 2 ].

  4 Where permitted by Section E 503.4.6.4.1, exception 2.

  2025 CALIFORNIA MECHANICAL CODE 425

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

  APPENDIX E

  (2) Systems serving zones where humidity levels are required to be maintained with precision of not more than ±5 percent relative humidity to comply with applicable codes or accreditation standards or as approved by the Authority Having Jurisdiction.

  [ASHRAE 90.1:6.4.3.6.2]

• CALGreen § 4-3 Medium relevance — show source text

  402 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

  403 Emergency Preparedness Requirements. . . . . . . . . . . 4-3 404 Fire Safety, Evacuation and Lockdown Plans . . . . . . 4-10 405 Emergency Evacuation Drills . . . . . . . . . . . . . . . . . . . . 4-13 406 Employee Training and Response Procedures. . . . . 4-15

  407 Hazard Communication. . . . . . . . . . . . . . . . . . . . . . . . . 4-15

  CHAPTER 5 FIRE SERVICE FEATURES. . . . . . . . . . . . . . . . . .5-3

  501 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

  502 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

  503 Fire Apparatus Access Roads . . . . . . . . . . . . . . . . . . . . . 5-3 504 Access to Building Openings and Roofs . . . . . . . . . . . . 5-5 505 Premises Identification . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

  506 Key Boxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5 507 Fire Protection Water Supplies. . . . . . . . . . . . . . . . . . . . 5-6 508 Fire Command Center . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7

  509 Fire Protection and Utility Equipment Identification and Access. . . . . . . . . . . . . . . . . . . . . . . 5-8

  510 Emergency Responder Communications Enhancement Systems . . . . . . . . . . . . . . . . . . . . . . . . 5-8

  CHAPTER 6 BUILDING SERVICES AND SYSTEMS . . . . . . . . .6-3

  601 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

  602 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

• CALGreen § 1.1 Medium relevance — show source text

  1—REFERENCED STANDARDS	Col2	Col3
  STANDARD ACRONYM	STANDARD NAME	SECTIONS HEREIN REFERENCED
  ASTM E90—09	Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements	BG102.1, BG102.1.1
  ASTM E336—20	Standard Test Method for Measurement of Airborne Sound Attenuation between Rooms in Buildings	BG102.1
  ASTM E492—09	Specification for Laboratory Measurement of Impact Sound Transmission through Floor-ceiling Assemblies Using the Tapping Machine	BG103.1
  ASTM E1007—21	Standard Test Method for Field Measurement of Tapping Machine Impact Sound Transmission Through Floor-Ceiling Assemblies and Associated Support Structures	BG103.1
  TMS 302—2018	Standard for Determining the Sound Transmission Class Rating for Masonry Assemblies	BG102.1.1

  2025 CALIFORNIA RESIDENTIAL CODE APPENDIX BG-3

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  APPENDIX BG-4 2025 CALIFORNIA RESIDENTIAL CODE

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

  CALIFORNIA RESIDENTIAL CODE – MATRIX ADOPTION TABLE

  APPENDIX BH – AUTOMATIC VEHICULAR GATES

  (Matrix Adoption Tables are nonregulatory, 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	Col6	Col7	DSA	Col9	Col10	OSHPD	Col12	Col13	Col14	Col15	Col16	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

  2025 CALIFORNIA RESIDENTIAL CODE APPENDIX BH-1

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  APPENDIX BH-2 2025 CALIFORNIA RESIDENTIAL CODE

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

• CALGreen § 1205.3.3 Medium relevance — show source text

  1205.3.3 Court drainage. The bottom of every court shall be properly graded and drained to a public sewer or other approved disposal system complying with the California Plumbing Code .

  SECTION 1206—SOUND TRANSMISSION

  1206.1 Scope. This section shall apply to common interior walls, partitions and floor/ceiling assemblies between adjacent dwelling units and sleeping units or between dwelling units and sleeping units and adjacent public areas.

  1206.2 Airborne sound. Walls, partitions and floor-ceiling assemblies separating dwelling units and sleeping units from each other or from public or service areas shall have a sound transmission class of not less than 50 where tested in accordance with ASTM E90, or have a Normalized Noise Isolation Class (NNIC) rating of not less than 45 if field tested, in accordance with ASTM E336 for airborne noise. Alternatively, the sound transmission class of walls, partitions and floor-ceiling assemblies shall be established by engineering analysis based on a comparison of walls, partitions and floor-ceiling assemblies having sound transmission class ratings as determined by the test procedures set forth in ASTM E90. Engineering analysis shall be performed by a registered design professional. Penetrations or openings in construction assemblies for piping; electrical devices; recessed cabinets; bathtubs; soffits; or heating, ventilating or exhaust ducts shall be sealed, lined, insulated or otherwise treated to maintain the required ratings. This requirement shall not apply to entrance doors; however, such doors shall be tight fitting to the frame and sill.

  1206.2.1 Masonry. The sound transmission class of concrete masonry and clay masonry assemblies shall be calculated in accordance with TMS 302 or determined through testing in accordance with ASTM E90.

  1206.3 Structure-borne sound. Floor-ceiling assemblies between dwelling units and sleeping units or between a dwelling unit or sleeping unit and a public or service area within the structure shall have an impact insulation class rating of not less than 50 where tested in accordance with ASTM E492, or have a Normalized Impact Sound Rating (NISR) of not less than 45 if field tested in accordance with ASTM E1007. Alternatively, the impact insulation class of floor-ceiling assemblies shall be established by engineering analysis based on a comparison of floor-ceiling assemblies having impact insulation class ratings as determined by the test procedures in ASTM E492. Engineering analysis shall be performed by a registered design professional.

  Exception: Impact sound insulation is not required for floor-ceiling assemblies over nonhabitable rooms or spaces not designed to be occupied, such as garages, mechanical rooms or storage areas.

  1206.4 Allowable interior noise levels. Interior noise levels attributable to exterior sources shall not exceed 45 dB in any habitable room. The noise metric shall be either the day-night average sound level (Ldn) or the community noise equivalent level (CNEL), consis- tent with the noise element of the local general plan.

  1206.5 Acoustical control. [BSC-CG] See California Green Building Standards Code, Chapter 5, Division 5.5 for additional sound trans- mission requirements.

  SECTION 1207—ENHANCED CLASSROOM ACOUSTICS

  1207.1 General. Enhanced classroom acoustics, where required by this section, shall comply with Section 808 of ICC A117.1.

  1207.2 Where required. In Group E occupancies, enhanced classroom acoustics shall be provided in all classrooms with a volume of 20,000 cubic feet (566 m [3] ) or less.

• CALGreen § 3-83 Medium relevance — show source text

  Exceptions:

  1. Exhaust ventilation shall not be required in areas with an approved engineered ventilation system, which maintains a hydrogen gas concentration at less than 25 percent of the lower flammability limit. 2. Mechanical exhaust ventilation for hydrogen shall not be required where the charging equipment utilized is installed and listed for indoor charging of electric vehicles without ventilation.

  2025 CALIFORNIA RESIDENTIAL CODE 3-83

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

  BUILDING PLANNING

  SECTION 339—RESERVED

  SECTION R340—POLLUTANT CONTROL

  R340.1 Finish material pollutant control. Finish materials including adhesives, sealants, caulks, paints and coatings, aerosol paints and coatings, carpet systems, carpet cushion, carpet adhesive, resilient flooring systems and composite wood products shall meet the volatile organic compound (VOC) emission limits in accordance with the California Green Building Standards Code, Chapter 4, Division 4.5.

  3-84 2025 CALIFORNIA RESIDENTIAL CODE

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  CALIFORNIA RESIDENTIAL CODE – MATRIX ADOPTION TABLE

  CHAPTER 4 – FOUNDATIONS

  (Matrix Adoption Tables are nonregulatory, 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	Col6	Col7	DSA	Col9	Col10	OSHPD	Col12	Col13	Col14	Col15	Col16	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)				X
  Adopt only those sections that are listed below																				X
  Chapter / Section
  R401.2				X
  R401.4.1.1 through R401.4.1.1.5				X
  R404.5.1				X
  R408.3				X
  R408.4				X
  R408.8																				X

  The state agency does not adopt sections identified with the following symbol: †

  2025 CALIFORNIA RESIDENTIAL CODE 4-1

• CALGreen § 101.4.7 Medium relevance — show source text

  Existing 101.4.7 Fire walls 706.1 Height (see Height, Building) 502.1, 503, 504, 505, 508, 510 Occupancy classification Chapter 3 Party walls 706.1.1 Relocatable 3113

  Replicable Appendix N Building, Existing 202 Building Department 103 Building Official Duties and powers 103, 104 Qualifications Appendix A Records 104.7

  Termination A101.4 Building-Integrated Photovoltaic (BIPV) (see Photovoltaic) Built-Up Roof 1507.10 Business Occupancy (Group B) 303.1.1, 303.1.2, 304 Alarms and detection 907.2.2 Ambulatory care facilities 304, 422 Area 503, 505, 506, 507, 508 Height 503, 504, 505, 508, 510 Higher education laboratories 428, 2702.2

  Incidental uses 509 Interior finishes Table 803.13, 804 Live load Table 1607.1 Means of egress Aisles 1018.3

  Stairway, exit access 1019 Travel distance 1006.3, 1017.2,

  1006.2.1

  Mixed occupancies 508.2, 508.3, 508.4 Accessory 303.1.2, 508.2 Ambulatory care facilities 422 Assembly 303.1.2

  Assembly spaces 1030 Exit signs 1013.1 Guards 1015.2, 1030.17 Main exit 1030.3

  Open air 1005.3.1, 1005.3.2, 1006.3, 1009.6.4, 1019.3, 1027, 1030.6.2 Panic hardware 1010.2.8, 1010.4.1 Smoke-protected 1005.3.1, 1005.3.2, 1006.3, 1009.6.4, 1019.3, 1027, 1030.6.2 Travel distance 1006.2.1, 1006.3, 1017.2, 1030.7 Mixed occupancies 508.3, 508.4 Accessory 508.2 Education 303.1.3

• CALGreen § 2.02 Medium relevance — show source text

  05|75°F/52°F (Class 1)|AHRI 1360| |Air cooled with free
  air discharge
  condenser|Ducted|≥29 000 Btu/h and
  <65 000 Btu/h|2.02|2.02|2.02| |Air cooled with free
  air discharge
  condenser|Ducted|≥65 000 Btu/h|1.92|1.92|1.92| |Air cooled with free
  air discharge
  condenser|Nonducted|<29 000 Btu/h|2.08|2.08|2.08| |Air cooled with free
  air discharge
  condenser|Nonducted|≥29 000 Btu/h and
  <65 000 Btu/h|2.05|2.05|2.05| |Air cooled with free
  air discharge
  condenser|Nonducted|≥65 000 Btu/h|1.94|1.94|1.94| |Air cooled with free
  air discharge
  condenser with fluid
  economizer|Ducted|<29 000 Btu/h|2.01|75°F/52°F (Class 1)|AHRI 1360| |Air cooled with free
  air discharge
  condenser with fluid
  economizer|Ducted|≥29 000 Btu/h and
  <65 000 Btu/h|1.97|1.97|1.97| |Air cooled with free
  air discharge
  condenser with fluid
  economizer|Ducted|≥65 000 Btu/h|1.87|1.87|1.87| |Air cooled with free
  air discharge
  condenser with fluid
  economizer|Nonducted|<29 000 Btu/h
  |2.04|2.04|2.04| |Air cooled with free
  air discharge
  condenser with fluid
  economizer|Nonducted|≥29 000 Btu/h and
  <65 000 Btu/h|2.00|2.00|2.00| |Air cooled with free
  air discharge
  condenser with fluid
  economizer|Nonducted|≥65 000 Btu/h
  |1.89
  |1.89
  |1.89
  | |Air cooled with
  ducted condenser|Ducted|<29 000 Btu/h|1.86|75°F/52°F (Class 1)|AHRI 1360| |Air cooled with
  ducted condenser|Ducted|≥29 000 Btu/h and
  <65 000 Btu/h|1.83|1.83|1.83| |Air cooled with
  ducted condenser|Ducted|≥65 000 Btu/h|1.73|1.73|1.73|

  2025 CALIFORNIA MECHANICAL CODE 471

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

  APPENDIX E

  TABLE E 503.7.1(17) (continued) CEILING-MOUNTED COMPUTER-ROOM AIR CONDITIONERS—MINIMUM EFFICIENCY REQUIREMENTS

  [ASHRAE 90.1: TABLE 6.8.1-17]

• CALGreen § 1102.3 Medium relevance — show source text

  The extent of segregation depends on the particular azeotrope and hardware system configuration. 4 The exact composition of this azeotrope is in question and additional experimental studies are needed. 5 R-507, R-508, and R-509 are allowed alternative designations for R-507A, R-508A, and R-509A due to a change in designations after assignment of R-500 through R-509. Corresponding changes were not made for R-500 through R-506. 6 The RCL values for these refrigerant blends are approximated in the absence of adequate data for a component comprising less than 4 percent m/m of the blend and expected to have a small influence in an acute, accidental release. 7 In accordance with Section 1102.3, ammonia refrigeration systems are not regulated by this chapter. R-717 (ammonia) is included in this table because the table is extracted from ASHRAE 34 and is not capable of being modified. 8 LFL is based on WCF @ 73.4°F (23°C) unless otherwise noted. 9 WCFF LFL @ 140°F (60°C). 10 WCFF LFL @ 73.4°F (23°C). 11 WCF LFL @ 212°F (100°C).

  254 2025 CALIFORNIA MECHANICAL CODE

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

  CALIFORNIA MECHANICAL CODE – MATRIX ADOPTION TABLE

  CHAPTER 12 – HYDRONICS

  (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	Col6	Col7	DSA	Col9	Col10	OSHPD	Col12	Col13	Col14	Col15	Col16	Col17	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	6	6	6	6	6	6	6	6	6
  Adopt Entire Chapter	X							X					X			X
  Adopt Entire Chapter as amended (amended sections listed below)				X	X					X	X	X		X	X
  Adopt only those sections that are listed below																					X
  Chapter/Section
  1205.2,Note				X	X
  1210.

• CALGreen § 5.507.4.2 High relevance — show source text

  5.507.4.2 Performance method. For buildings located as defined in Section 5.507.4.1 or 5.507.4.1.1, wall and roof-ceiling assemblies exposed to the noise source making up the building or addition envelope or altered envelope shall be constructed to provide an interior noise environment attributable to exterior sources that does not exceed an hourly equivalent noise level ( L eq - 1Hr) of 50 dBA in occupied areas during any hour of operation.

  5.507.4.2.1 Site features. Exterior features such as sound walls or earth berms may be utilized as appropriate to the building, addition or alteration project to mitigate sound migration to the interior.

  5.507.4.2.2 Documentation of compliance. An acoustical analysis documenting complying interior sound levels shall be prepared by personnel approved by the architect or engineer of record.

  5.507.4.3 Interior sound transmission. Wall and floor- ceiling assemblies separating tenant spaces and tenant spaces and public places shall have an STC of at least 40.

  Note: Examples of assemblies and their various STC ratings may be found at the [California Office of Noise Control:](http://www.toolbase.org/PDF/CaseStudies/ stc_icc_ratings.pdf) http://www.toolbase.org/PDF/CaseStudies/ stc_icc_ratings.pdf.

  SECTION 5.508

  OUTDOOR AIR QUALITY

  5.508.1 Ozone depletion and greenhouse gas reductions. Installations of HVAC, refrigeration and fire suppression equipment shall comply with Sections 5.508.1.1 and 5.508.1.2.

  5.508.1.1 Chlorofluorocarbons (CFCs). Install HVAC, refrigeration and fire suppression equipment that do not contain CFCs.

  5.508.1.2 Halons. Install HVAC, refrigeration and fire suppression equipment that do not contain Halons.

  5.508.2 Supermarket refrigerant leak reduction. New commercial refrigeration systems shall comply with the provisions of this section when installed in retail food stores 8,000 square feet or more conditioned area, and that utilize either refrigerated display cases, or walk-in coolers or freezers connected to remote compressor units or condensing units. The leak reduction measures apply to refrigeration systems containing high-global-warming potential (high-GWP) refrigerants with a GWP of 150 or greater. New refrigeration systems include both new facilities and the replacement of existing refrigeration systems in existing facilities.

  Exception: Refrigeration systems containing low-global warming potential (low-GWP) refrigerant with a GWP value less than 150 are not subject to this section. Low-GWP refrigerants are nonozone-depleting refrigerants that include ammonia, carbon dioxide (CO 2 ), and potentially other refrigerants.

  5.508.2.1 Refrigerant piping. Piping compliant with the California Mechanical Code shall be installed to be accessible for leak protection and repairs. Piping runs using threaded pipe, copper tubing with an outside diameter (OD) less than [1] / 4 inch, flared tubing connections and short radius elbows shall not be used in refrigerant systems except as noted below.

  5.508.2.1.1 Threaded pipe. Threaded connections are permitted at the compressor rack. 5.508.2.1.2 Copper pipe. Copper tubing with an OD less than [1] / 4 inch may be used in systems with a refrigerant charge of 5 pounds or less.

• CALGreen § 5.508.1.2 Medium relevance — show source text

  5.508.1.2 Halons. Install HVAC, refrigeration and fire suppression equipment that do not contain Halons.

  5.508.2 Supermarket refrigerant leak reduction. New commercial refrigeration systems shall comply with the provisions of this section when installed in retail food stores 8,000 square feet or more conditioned area, and that utilize either refrigerated display cases, or walk-in coolers or freezers connected to remote compressor units or condensing units. The leak reduction measures apply to refrigeration systems containing high-global-warming potential (high-GWP) refrigerants with a GWP of 150 or greater. New refrigeration systems include both new facilities and the replacement of existing refrigeration systems in existing facilities.

  Exception: Refrigeration systems containing low-global warming potential (low-GWP) refrigerant with a GWP value less than 150 are not subject to this section. Low-GWP refrigerants are nonozone-depleting refrigerants that include ammonia, carbon dioxide (CO 2 ), and potentially other refrigerants.

  5.508.2.1 Refrigerant piping. Piping compliant with the California Mechanical Code shall be installed to be accessible for leak protection and repairs. Piping runs using threaded pipe, copper tubing with an outside diameter (OD) less than [1] / 4 inch, flared tubing connections and short radius elbows shall not be used in refrigerant systems except as noted below.

  5.508.2.1.1 Threaded pipe. Threaded connections are permitted at the compressor rack. 5.508.2.1.2 Copper pipe. Copper tubing with an OD less than [1] / 4 inch may be used in systems with a refrigerant charge of 5 pounds or less.

  5.508.2.1.2.1 Anchorage. One-fourth-inch OD tubing shall be securely clamped to a rigid base to keep vibration levels below 8 mils.

  5.508.2.1.3 Flared tubing connections. Double-flared tubing connections may be used for pressure controls, valve pilot lines and oil.

  Exception: Single-flared tubing connections may be used with a multiring seal coated with industrial sealant suitable for use with refrigerants and tightened in accordance with manufacturer’s recommendations.

  5.508.2.1.4 Elbows. Short radius elbows are only permitted where space limitations prohibit use of long radius elbows.

  5.508.2.2 Valves. Valves and fittings shall comply with the California Mechanical Code and as follows.

  5.508.2.2.1 Pressure relief valves. For vessels containing high-GWP refrigerant, a rupture disc shall be installed between the outlet of the vessel and the inlet of the pressure relief valve.

  5.508.2.2.1.1 Pressure detection. A pressure gauge, pressure transducer or other device shall be installed in the space between the rupture disc and the relief valve inlet to indicate a disc rupture or discharge of the relief valve.

  5.508.2.2.2 Access valves. Only Schrader access valves with a brass or steel body are permitted for use.

  5.508.2.2.2.1 Valve caps. For systems with a refrigerant charge of 5 pounds or more, valve caps shall be brass or steel and not plastic.

  5.508.2.2.2.2 Seal caps. If designed for it, the cap shall have a neoprene O-ring in place.

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 5-37

• CALGreen § 5.504.5 Medium relevance — show source text

  5**
  Environmental
  Quality|Mandatory|Filters (with exceptions)|5.504.5||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Filters: labeling|5.504.5.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Environmental tobacco smoke (ETS) control|5.504.7||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Indoor moisture control|5.505.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Outside air delivery|5.506.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Carbon dioxide (CO2) monitoring|5.506.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Carbon dioxide (CO2) monitoring in classrooms|5.506.3||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Acoustical control (with exception)|5.507.4||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Exterior noise transmission, prescriptive method
  (with exceptions)|5.507.4.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Noise exposure where noise contours are not readily
  available|5.507.4.1.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Performance method|5.507.4.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Site features|5.507.4.2.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Documentation of compliance|5.507.4.2.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Interior sound transmission (with note)|5.507.4.3||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Ozone depletion and greenhouse gas reductions|5.508.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Chlorofluorocarbons (CFCs)|5.508.1.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Halons|5.508.1.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality|Mandatory|Supermarket refrigerant leak reduction for retail food
  stores 8,000 square feet or more|5.508.

• CALGreen § 5.507.4.2.1 Medium relevance — show source text

  5**
  Environmental
  Quality
  Select One Elective|Mandatory|Site features|5.507.4.2.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Mandatory|Documentation of compliance|5.507.4.2.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Mandatory|Interior sound transmission (with note)|5.507.4.3||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Mandatory|Ozone depletion and greenhouse gas reductions|5.508.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Mandatory|Chlorofluorocarbons (CFCs)|5.508.1.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Mandatory|Halons|5.508.1.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Mandatory|Supermarket refrigerant leak reduction for retail food
  stores 8,000 square feet or more Sections 5.508.2 through
  5.508.2.6.3|5.508.2 through
  5.508.2.6.3||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Select One Elective|Elective|Indoor air quality (IAQ) during construction|A5.504.1,
  A5.504.1.1,
  A5.504.1.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Select One Elective|Elective|IAQ postconstruction|A5.504.2||||| |(continued)
  **DIVISION 5.

• CALGreen § 507.4.2.2 Medium relevance — show source text

  507.4.2.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Mandatory|Interior sound transmission (with note)|5.507.4.3||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Mandatory|Ozone depletion and greenhouse gas reductions|5.508.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Mandatory|Chlorofluorocarbons (CFCs)|5.508.1.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Mandatory|Halons|5.508.1.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Mandatory|Supermarket refrigerant leak reduction for retail food stores
  8,000 square feet or more Sections 5.508.2 through 5.508.2.6.3|5.508.2 through
  5.508.2.6.3||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Select Three Electives|Elective|Indoor air quality (IAQ) during construction|A5.504.1,
  A5.504.1.1,
  A5.504.1.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Select Three Electives|Elective|IAQ postconstruction|A5.504.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Select Three Electives|Elective|IAQ testing|A5.504.2.1,
  A5.504.2.1.1,
  A5.504.2.1.2,
  A5.504.2.1.3||||| |(continued)
  **DIVISION 5.

• CALGreen § 5.5 Medium relevance — show source text

  5**
  Environmental
  Quality
  Select Three Electives|(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Mandatory|Supermarket refrigerant leak reduction for retail food stores
  8,000 square feet or more Sections 5.508.2 through 5.508.2.6.3|5.508.2 through
  5.508.2.6.3||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Select Three Electives|Elective|Indoor air quality (IAQ) during construction|A5.504.1,
  A5.504.1.1,
  A5.504.1.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Select Three Electives|Elective|IAQ postconstruction|A5.504.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Select Three Electives|Elective|IAQ testing|A5.504.2.1,
  A5.504.2.1.1,
  A5.504.2.1.2,
  A5.504.2.1.3||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Select Three Electives|Elective|No added formaldehyde Tier 1 (with notes)|A5.504.4.5.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Select Three Electives|Elective|Hazardous particulates and chemical pollutants|A5.504.5||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Select Three Electives|Elective|Entryway systems|A5.504.5.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Select Three Electives|Elective|Isolation of pollutant sources|A5.504.5.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Select Three Electives|Elective|Lighting and thermal comfort controls|A5.507.1,
  A5.507.1.1
  through
  A5.507.1.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select Three Electives|Select Three Electives|Elective|Daylight|_A5.507.

• CALGreen § 8-14 Medium relevance — show source text

  8-14 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

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

  COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL

  Selection of “trained,” qualified personnel is required by this code. In order to meet this requirement, the commissioning provider should be evaluated via the methods discussed above. In addition, various organizations have training and certification programs that may be a source for identification of qualified commissioning providers.

  For information about enforcement and compliance of each commissioning element see Sections 5.410.2.1 through 5.410.2.6.

  For compliance forms and templates see Part 2 following this standard.

  Reference: 1 Owner’s Project Requirements

  CALGreen Section 5.410.2.1, Owner’s or Owner representative’s Project Requirements (OPR).

  1.1 Intent:

  The Owner’s Project Requirements (OPR) documents the functional requirements of a project and expectations of the building use and operation as it relates to systems being commissioned. The document describes the physical and functional building characteristics desired by the owner and establishes performance and acceptance criteria. The OPR is most effective when developed during predesign and used to develop the Basis of Design (BOD) during the design process. The level of detail and complexity of the OPR will vary according to building use, type and systems.

  1.2 Compliance Method:

  Compliance is demonstrated by the owner or owner’s representative developing and/or approving the Owner’s Project Requirements (OPR) document and can be defined as follows:

  1. Environmental and Sustainability Goals—Establish environmental project goals and objectives exceeding the code for the project’s sustainability, which may include: a. CALGreen voluntary measures or Tiers sought, or other specific green building rating system or program credits and/or level of certification sought b. Specific environmental or sustainability goals such as water efficiency, water reuse, CO 2 monitoring, xeriscaping, etc.
  2. Building Sustainable Goals—Establish goals and targets affecting energy efficiency, which may include: a. Measures affecting building sustainability desired by owner i. Building orientation and siting ii. Daylighting iii. Facade, envelope and fenestration

  iv. Roof

  v. Natural ventilation

  vi. Onsite renewable power generation and net-zero energy use vii. Landscaping and shading 3. Indoor Environmental Quality Requirements—For each program space describe indoor environmental requirements including intended use and anticipated schedule, and the following: a. Temperature and humidity

  b. Acoustics

  c. Air quality, ventilation and filtration d. Desired adjustability of system controls

  e. Accommodations for after-hours use

  f. Other owner requirements including natural ventilation, operable windows, daylight, views, etc. 4. Project Program, including facility functions and hours of operation, and need for after-hours operation—Describe primary purpose, program and use of proposed project include the following: a. Building size, number of stories, construction type, occupancy type and number b. Building program areas including intended use and anticipated occupancy schedules c. Future expandability and flexibility of spaces d. Quality and/or durability of materials and building lifespan desired e. Budget or operational constraints f. Applicable codes 5. Equipment and Systems Expectations—Describe the following for each system commissioned: a. Level of quality, reliability, equipment type, automation, flexibility, maintenance and complexity desired b. Specific efficiency targets, desired technologies or preferred manufacturers for building systems, acoustics and vibration c. Degree of system integration, automation and functionality for controls 6.

• CALGreen § 508.1.1 Medium relevance — show source text

  508.1.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Mandatory|Halons|5.508.1.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Mandatory|Supermarket refrigerant leak reduction for retail food
  stores 8,000 square feet or more Sections 5.508.2 through
  5.508.2.6.3|5.508.2 through
  5.508.2.6.3||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Select One Elective|Elective|Indoor air quality (IAQ) during construction|A5.504.1,
  A5.504.1.1,
  A5.504.1.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Select One Elective|Elective|IAQ postconstruction|A5.504.2||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Select One Elective|Elective|IAQ testing|A5.504.2.1,
  A5.504.2.1.1,
  A5.504.2.1.2,
  A5.504.2.1.3||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Select One Elective|Elective|No added formaldehyde Tier 1 (with notes)|A5.504.4.5.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Select One Elective|Elective|Hazardous particulates and chemical pollutants|A5.504.5||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Select One Elective|Elective|Entryway systems|A5.504.5.1||||| |(continued)
  DIVISION 5.5
  Environmental
  Quality
  Select One Elective|Select One Elective|Elective|Isolation of pollutant sources|A5.504.5.2||||| |(continued)
  **DIVISION 5.

• CALGreen § 8-15 Medium relevance — show source text

  2. Building Sustainable Goals—Establish goals and targets affecting energy efficiency, which may include: a. Measures affecting building sustainability desired by owner i. Building orientation and siting ii. Daylighting iii. Facade, envelope and fenestration

  iv. Roof

  v. Natural ventilation

  vi. Onsite renewable power generation and net-zero energy use vii. Landscaping and shading 3. Indoor Environmental Quality Requirements—For each program space describe indoor environmental requirements including intended use and anticipated schedule, and the following: a. Temperature and humidity

  b. Acoustics

  c. Air quality, ventilation and filtration d. Desired adjustability of system controls

  e. Accommodations for after-hours use

  f. Other owner requirements including natural ventilation, operable windows, daylight, views, etc. 4. Project Program, including facility functions and hours of operation, and need for after-hours operation—Describe primary purpose, program and use of proposed project include the following: a. Building size, number of stories, construction type, occupancy type and number b. Building program areas including intended use and anticipated occupancy schedules c. Future expandability and flexibility of spaces d. Quality and/or durability of materials and building lifespan desired e. Budget or operational constraints f. Applicable codes 5. Equipment and Systems Expectations—Describe the following for each system commissioned: a. Level of quality, reliability, equipment type, automation, flexibility, maintenance and complexity desired b. Specific efficiency targets, desired technologies or preferred manufacturers for building systems, acoustics and vibration c. Degree of system integration, automation and functionality for controls 6. Building Occupant and O&M Personnel Expectations—Describe the following: a. How building will be operated and by whom b. Level of training and orientation required to understand, operate and use the building systems for building operation and maintenance staff, as well as occupants c. Building operation and maintenance staff location and capabilities

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 8-15

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

  COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL

  1.3 Enforcement:

  At their discretion, the inspector confirms demonstrated compliance at Plan Intake by: a) Receipt of a copy of the OPR document, or b) Receipt of a form signed by the owner or owner representative attesting that the OPR has been completed and approved by the owner.

  Reference: 2 Basis of Design (BOD)

  CALGreen Section 5.410.2.2, Basis of Design (BOD).

  2.1 Intent:

  The Basis of Design (BOD) describes the building systems to be commissioned and outlines design assumptions not indicated in the design documents. The design team develops the BOD to describe how the building systems’ design meets the Owner’s Project Requirements (OPR), and why the systems were selected. The BOD is most effective when developed early in the project design and updated as necessary throughout the design process.

  2.2 Compliance Method:

  Compliance requires the completion of the BOD document and should include the following where applicable: 1.

• CALGreen § 5.410.2.1 Medium relevance — show source text

  CALGreen Commissioning Requirement 5.410.2.1, Owner’s Project Requirements (OPR)

  5.410.2.1 Owner’s or Owner representative’s Project Requirements (OPR). [N] The expectations and requirements of the building appropriate to its phase shall be documented before the design phase of the project begins. This documentation shall include the following: 1. Environmental and sustainability goals. 2. Building sustainable goals. 3. Indoor environmental quality requirements. 4. Project program, including facility functions and hours of operation, and need for after hours operation. 5. Equipment and systems expectations. 6. Building occupant and operation and maintenance (O&M) personnel expectations.

  Col1	OPR ELEMENTS	INCLUDED
  1.	Environmental and sustainability goals.	
  2.	Building sustainable goals.	
  3.	Indoor environmental quality requirements.	
  4.	Project program, including facility functions and hours of operation, and need for after-hours operation.	
  5.	Equipment and systems expectations.	
  6.	Building occupant and O&M personnel expectations.	

  ---

  Owner/Owner’s Representative Signature Date

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 8-23

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

  COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL

  OWNER’S PROJECT REQUIREMENTS (OPR)

  COMPLIANCE CHECKLIST

  INCORPORATE THIS FORM IN THE PLANS

  Project Address: _________________________________________________________

  Permit Number: _____________________________

  ITEM #	OPR ITEMS	PAGE NUMBER IN OPR DOCUMENT
  	OWNER AND USER REQUIREMENTS—PROJECT PROGRAM
  1	General building information (size, stories, construction type, occupancy type and number)
  2	Intended uses and schedules
  3	Future expandability and flexibility of spaces
  4	Quality and/or durability of materials and desired building lifespan
  5	Budget or operation constraints
  	ENVIRONMENTAL AND SUSTAINABILITY GOALS
  6	Level of compliance with the_California Green Building Standards Code_: Mandatory, Tier 1 or Tier 2
  7	Specific environmental or sustainability goals (e.g., water efficiency, water reuse, CO2 monitoring, xeriscaping, etc.)
  	BUILDING SUSTAINABLE GOALS
  8	Measures affecting energy efficiency desired by owner (e.g., building orientation, shading, daylighting, natural venti- lation, renewable power, etc.)
  	INDOOR ENVIRONMENTAL QUALITY REQUIREMENTS
  9	Lighting
  10	Temperature and humidity
  11	Acoustics
  12	Air quality, ventilation and filtration
  13	Desired adjustability of system controls
  14	Accommodations for after-hours use
  15	Other owner requirements (e.g., natural ventilation, daylight, views, etc.)
  	EQUIPMENT AND SYSTEMS EXPECTATIONS
  16	Level of quality, reliability, equipment type, flexibility, maintenance and complexity desired
  17	Specific efficiency targets, desired technologies or preferred manufacturers for building systems, acoustics and vibration
  18	Degree of system integration, automation and functionality for controls (i.e. load shedding, demand response,

• CALGreen § 5.5 Medium relevance — show source text

  DIVISION 5.5 – ENVIRONMENTAL QUALITY

  SECTION 5.501—GENERAL

  5.501.1 Scope. The provisions of this chapter shall outline means of reducing the quantity of air contaminants that are odorous, irritating and/or harmful to the comfort and well-being of a building’s installers, occupants and neighbors.

  SECTION 5.502—DEFINITIONS

  5.502.1 Definitions. The following terms are defined in Chapter 2.

  1 BTU/HOUR.

  ARTERIAL HIGHWAY.

  A-WEIGHTED SOUND LEVEL (dBA).

  COMMUNITY NOISE EQUIVALENT LEVEL (CNEL).

  COMPOSITE WOOD PRODUCTS.

  DAY-NIGHT AVERAGE SOUND LEVEL (Ldn).

  DECIBEL (dB).

  ENERGY EQUIVALENT (NOISE) LEVEL (L eq ).

  EXPRESSWAY.

  FREEWAY.

  GLOBAL WARMING POTENTIAL (GWP).

  GLOBAL WARMING POTENTIAL VALUE (GWP VALUE).

  HIGH-GWP REFRIGERANT.

  LONG RADIUS ELBOW.

  LOW-GWP REFRIGERANT.

  MERV.

  MAXIMUM INCREMENTAL REACTIVITY (MIR).

  PRODUCT-WEIGHTED MIR (PWMIR).

  PSIG.

  REACTIVE ORGANIC COMPOUND (ROC).

  SCHRADER ACCESS VALVES.

  SHORT RADIUS ELBOW.

  SUPERMARKET.

  VOC.

  SECTION 5.503—FIREPLACES

  5.503.1 Fireplaces. Install only a direct-vent sealed-combustion gas or sealed wood-burning fireplace, or a sealed woodstove or pellet stove, and refer to residential requirements in the California Energy Code, Title 24, Part 6, Subchapter 7, Section 150. Woodstoves, pellet stoves and fireplaces shall comply with applicable local ordinances.

  5.503.1.1 Woodstoves. Woodstove and pellet stoves shall comply with US EPA New Source Performance Standards (NSPS) emission limits as applicable, and shall have a permanent label indicating they are certified to meet the emission limits.

  SECTION 5.504—POLLUTANT CONTROL

  5.504.1 Temporary ventilation. The permanent HVAC system shall only be used during construction if necessary to condition the building or areas of addition or alteration within the required temperature range for material and equipment installation. If the HVAC system is used during construction, use return air filters with a Minimum Efficiency Reporting Value (MERV) of 13, based on ASHRAE 52.2. Replace all filters immediately prior to occupancy, or, if the building is occupied during alteration, at the conclusion of construction.

  5.504.2 Reserved.

  5.504.3 Covering of duct openings and protection of mechanical equipment during construction. At the time of rough installation and during storage on the construction site until final startup of the heating, cooling and ventilating equipment, all duct and

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 5-31

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  NONRESIDENTIAL MANDATORY MEASURES

• CALGreen § 504.4.2 Medium relevance — show source text

  504.4.2||||||||X||||||||||||||| |5.504.4.3||||||||X||||||||||||||| |5.504.4.3.1||||||||X||||||||||||||| |Table 5.504.4.3||||||||X||||||||||||||| |5.504.4.3.2||||||||X||||||||||||||| |5.504.4.4 and subsections||||||||X||||||||||||||| |5.504.4.5||||||||X||||||||||||||| |Table 5.504.4.5||||||||X||||||||||||||| |5.504.4.6||||||||X||||||||||||||| |5.504.4.7 and subsections||||||||X||||||||||||||| |5.504.4.8 and subsections||||||||X||||||||||||||| |5.504.5.3||||||||X||||||||||||||| |5.505||||||||X||||||||||||||| |5.506.1||||||||X||||||||||||||| |5.506.3||†||||||X||||||||||||||| |5.507.4 and subsections||||||||X||||||||||||||| |5.508.1 and subsections||||||||X|||||||||||||||

  The state agency does not adopt sections identified by the following symbol: †.

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 5-29

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  5 NONRESIDENTIAL MANDATORY MEASURES

  DIVISION 5.5 – ENVIRONMENTAL QUALITY

  SECTION 5.501—GENERAL

  5.501.1 Scope. The provisions of this chapter shall outline means of reducing the quantity of air contaminants that are odorous, irritating and/or harmful to the comfort and well-being of a building’s installers, occupants and neighbors.

  SECTION 5.502—DEFINITIONS

  5.502.1 Definitions. The following terms are defined in Chapter 2.

  1 BTU/HOUR.

  ARTERIAL HIGHWAY.

  A-WEIGHTED SOUND LEVEL (dBA).

  COMMUNITY NOISE EQUIVALENT LEVEL (CNEL).

  COMPOSITE WOOD PRODUCTS.

  DAY-NIGHT AVERAGE SOUND LEVEL (Ldn).

  DECIBEL (dB).

  ENERGY EQUIVALENT (NOISE) LEVEL (L eq ).

  EXPRESSWAY.

  FREEWAY.

  GLOBAL WARMING POTENTIAL (GWP).

  GLOBAL WARMING POTENTIAL VALUE (GWP VALUE).

  HIGH-GWP REFRIGERANT.

  LONG RADIUS ELBOW.

  LOW-GWP REFRIGERANT.

  MERV.

  MAXIMUM INCREMENTAL REACTIVITY (MIR).

  PRODUCT-WEIGHTED MIR (PWMIR).

  PSIG.

  REACTIVE ORGANIC COMPOUND (ROC).

  SCHRADER ACCESS VALVES.

  SHORT RADIUS ELBOW.

  SUPERMARKET.

  VOC.

  SECTION 5.503—FIREPLACES

• CALGreen § 602.1 Medium relevance — show source text

  VOLUNTARY MEASURES. . . . . . . . . . . . . . . . . APPENDIX A5-3

  A5.1 Planning and Design . . . . . . . . . . . . . . . . . APPENDIX A5-3 A5.2 Energy Efficiency . . . . . . . . . . . . . . . . . . . APPENDIX A5-13 A5.3 Water Efficiency and Conservation . . . APPENDIX A5-19 A5.4 Material Conservation and Resource Efficiency . . . . . . . . . . . . . . . . . . . . . . . . APPENDIX A5-25 A5.5 Environmental Quality . . . . . . . . . . . . . . APPENDIX A5-35 A5.6 Voluntary Tiers . . . . . . . . . . . . . . . . . . . . . APPENDIX A5-41 A5.601 CALGren Tier 1 and Tier 2. . . . . . . . . . APPENDIX A5-41

  A5.602 CALGreen Verification Guidelines Mandatory Measures Checklist . . . . . . . . . . . . . . . APPENDIX A5-44

  A5.602.1 CALGreen Verification Guidelines

  Tier 1 Checklist . . . . . . . . . . . . . . . . . APPENDIX A5-48

  A5.602.2 CALGreen Verification Guidelines

  Tier 2 Checklist . . . . . . . . . . . . . . . . . APPENDIX A5-55

  APPENDIX A6 VOLUNTARY STANDARDS FOR HEALTH

  FACILITIES [OSHPD 1, 2 & 4] . . . . . . . . . . . APPENDIX A6.1-3 A6.1 Site Planning and Design . . . . . . . . . . . APPENDIX A6.1-3 A6.2 Energy Efficiency . . . . . . . . . . . . . . . . . . APPENDIX A6.1-3 A6.4 Material Conservation and Resource Efficiency . . . . . . . . . . . . . APPENDIX A6.1-32 A6.5 Environmental Quality . . . . . . . . . . . . APPENDIX A6.1-33

  INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INDEX-1

  HISTORY NOTE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HIST-1

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  CALIFORNIA GREEN BUILDING STANDARDS CODE – MATRIX ADOPTION TABLE

  CHAPTER 1 – ADMINISTRATION

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

  |Adopting

• CALGreen § 8-40 Medium relevance — show source text

  . . . . . . . . . . . . . 8-40

  APPENDIX A4 RESIDENTIAL

  VOLUNTARY MEASURES. . . . . . . . . . . . . . . . . APPENDIX A4-3

  A4.1 Planning and Design . . . . . . . . . . . . . . . . . APPENDIX A4-3 A4.2 Energy Efficiency . . . . . . . . . . . . . . . . . . . . APPENDIX A4-9 A4.3 Water Efficiency and Conservation . . . APPENDIX A4-13 A4.4 Material Conservation and Resource Efficiency . . . . . . . . . . . . . . . . . . . . . . . . APPENDIX A4-15 A4.5 Environmental Quality . . . . . . . . . . . . . . APPENDIX A4-19 A4.6 Tier 1 and Tier 2 . . . . . . . . . . . . . . . . . . . . APPENDIX A4-21

  Division A4.6—Residential Occupancies Application Checklist . . . . . . . . . . . . . APPENDIX A4-23 A4.7 Residential Model Ordinance . . . . . . . . . APPENDIX A4-31

  APPENDIX A5 NONRESIDENTIAL

  VOLUNTARY MEASURES. . . . . . . . . . . . . . . . . APPENDIX A5-3

  A5.1 Planning and Design . . . . . . . . . . . . . . . . . APPENDIX A5-3 A5.2 Energy Efficiency . . . . . . . . . . . . . . . . . . . APPENDIX A5-13 A5.3 Water Efficiency and Conservation . . . APPENDIX A5-19 A5.4 Material Conservation and Resource Efficiency . . . . . . . . . . . . . . . . . . . . . . . . APPENDIX A5-25 A5.5 Environmental Quality . . . . . . . . . . . . . . APPENDIX A5-35 A5.6 Voluntary Tiers . . . . . . . . . . . . . . . . . . . . . APPENDIX A5-41 A5.601 CALGren Tier 1 and Tier 2. . . . . . . . . . APPENDIX A5-41

  A5.602 CALGreen Verification Guidelines Mandatory Measures Checklist . . . . . . . . . . . . . . . APPENDIX A5-44

  A5.602.1 CALGreen Verification Guidelines

  Tier 1 Checklist . . . . . . . . . . . . . . . . . APPENDIX A5-48

  A5.602.2 CALGreen Verification Guidelines

  Tier 2 Checklist . . . . . . . . . . . . . . . . . APPENDIX A5-55

  APPENDIX A6 VOLUNTARY STANDARDS FOR HEALTH

• CALGreen § 120.6 Medium relevance — show source text

  6(a), 120.6(f), 130.0(c), Table 140.3-A, 140.4(b)7, Table 140.4-C, 140.6(a), 140.6(b), 140.6(c), Table 140.6-B, Table 140.6-C, 140.9(a), Table 140.9-D, 160.2(c), 160.5(b), 170.2(c), Table 170.2-D, 170.2(e), Table 170.2-M, Table 170.2-N, Table 170.2-Q Sensing zone 120.2(e), 120.5(a), 160.3(a)2, 160.3(d) Sensor ventilation control 120.1(d), 120.1(e), 160.2(c)5, 160.3(a) Occupiable Space 120.1(c)1, 120.4(g), 120.6(c), 141.0(b) 150.0(a), 150.0(m), 150.0(o), 160.2(a), 160.2(b), 160.2(c), 160.3(b), 160.3(c), 180.2(b)2B Occupied 120.1(c), 120.1(d), 120.1(h), 120.2(e), 120.2(k), 120.4(b), 120.6(c), 120.6(f), 130.1(c), 130.2(c)2, 140.4(e), 140.4(m), 140.4(p), 140.6(c), 140.9(c), Table 140.9-D, 140.10(a), 150.1(c), 160.2(c), 160.2(d), 160.3(a), 160.3(c), 160.5(b), 160.5(c), 160.6(d), 170.2(a), 170.2(c), 170.2(e), 170.2(f), 170.2(g) Occupied Roof 140.10(a)2, 150.1(c)14, 170.2(f), 170.2(g) Occupied Space 120.4(b)1, 120.4(b)2, 140.3(a)6, 140.4(e), 140.4(m), 140.4(p), 170.2(c)4K Occupied-Standby Mode 120.1(d), 120.1(h), 120.2(e), 130.1(f), 160.2(c) Off-Setting 110.9(b)3 Oil-Fired Furnace 110.2(d) On/Off Control 150.0(o), 150.1(c), 150.2(b)1H, 170.2(d) Online Capacity 120.6(e) On-Off Switch 110.4(a) On-Site Heat Recovery 120.6(h) Opaque 120.6(h), 120.7(a), 120.7(b)6, 7, 120.7(c), 140.3(d)2, 141.0(b)1A, 141.0(b)1B,

  2025 CALIFORNIA ENERGY CODE 315

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  INDEX

  140.4(b), 140.

• CALGreen § 1108.4 Medium relevance — show source text

  3_Exception_
  1108.4
  |||X|||||||X||||X||||||||||| |Adopting Agency
  Adopt Entire Chapter
  Adopt Entire Chapter as
  amended (amended sections
  listed below)
  Adopt only those sections
  that are listed below
  Chapter/Section
  1104.3_Exception_
  1108.4
  ||||||||||||||||||||||||| |Adopting Agency
  Adopt Entire Chapter
  Adopt Entire Chapter as
  amended (amended sections
  listed below)
  Adopt only those sections
  that are listed below
  Chapter/Section
  1104.3_Exception_
  1108.4
  ||||||||||||||||||||||||| |Adopting Agency
  Adopt Entire Chapter
  Adopt Entire Chapter as
  amended (amended sections
  listed below)
  Adopt only those sections
  that are listed below
  Chapter/Section
  1104.3_Exception_
  1108.4
  ||||||||||X||||X||||||||||| |Adopting Agency
  Adopt Entire Chapter
  Adopt Entire Chapter as
  amended (amended sections
  listed below)
  Adopt only those sections
  that are listed below
  Chapter/Section
  1104.3_Exception_
  1108.4
  |||X||||||||||||||||||||||

  This state agency does not adopt sections identified with the following symbol: 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.

  2025 CALIFORNIA MECHANICAL CODE 225

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

  226 2025 CALIFORNIA MECHANICAL CODE

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  CHAPTER 11

  REFRIGERATION

  1101.0 General.

  1101.1 Applicability. Part I governs the design, installation, and construction of refrigeration systems, equipment, refrigerant piping, pressure vessels, safety devices, replacement of parts, alterations, and substitution of different refrigerants. Part II governs the installation and construction of cooling

  towers.

  1101.2 Equipment. Equipment for refrigerant recovery, recycling, or both shall comply with UL 1963.

  Part I – Refrigeration Systems.

  1102.0 Refrigeration Systems.

  1102.1 General. Refrigeration systems using a refrigerant other than ammonia shall comply with this chapter and ASHRAE 15. Refrigeration systems containing carbon dioxide as the refrigerant shall also comply with IIAR CO2.

  1102.2 Ammonia Refrigeration Systems. Refrigeration systems using ammonia as the refrigerant shall comply with IIAR 2, IIAR 3, IIAR/ANSI 4, IIAR 5, and IIAR 6 and shall not be required to comply with this chapter.

  1102.3 Refrigerants. The refrigerant used shall be of a type listed in Table 1102.3 or in accordance with ASHRAE 34

  where approved by the Authority Having Jurisdiction.

  Exception: Lithium bromide absorption systems using water as the refrigerant.

• CALGreen § 5.3 Medium relevance — show source text

  3,3-trifluoro-1- propene|A1|800|5.3|––| |R-1234yf|CF3CF=CH2|2, 3, 3, 3-tetrafluoro-1-propene|A2L|500|4.5|18.0| |R-1234ze(E)|CF3CH=CFH|Trans-1,3,3,3- tetrafluoro-1-propene|A2L|800|4.7|18.8| |R-1270|CH3CH=CH2|Propene (propylene)|A3|500|0.11|2.9| |R-1336mzz(E)|CF3CH=CHCF3|Trans-1,1,1,4,4,4-hexafluoro-2-butene|A1|400|3.0|––| |R-1336mzz(Z)|CF3CHCHCF3|Cis-1,1,1,4,4,4-hexaflouro-2-butene|A1|500|5.2|––|

  For SI units: 1 pound = 0.453 kg, 1 cubic foot = 0.0283 m [3]

  Notes: 1 The preferred chemical name is followed by the popular name in parenthesis. 2 The OELs are 8-hour TWAs; a “C” designation denotes a ceiling limit. 3 Azeotropic refrigerants exhibit some segregation of components at conditions of temperature and pressure other than those at which they were formulated. The extent of segregation depends on the particular azeotrope and hardware system configuration. 4 The exact composition of this azeotrope is in question and additional experimental studies are needed. 5 R-507, R-508, and R-509 are allowed alternative designations for R-507A, R-508A, and R-509A due to a change in designations after assignment of R-500 through R-509. Corresponding changes were not made for R-500 through R-506. 6 The RCL values for these refrigerant blends are approximated in the absence of adequate data for a component comprising less than 4 percent m/m of the blend and expected to have a small influence in an acute, accidental release. 7 In accordance with Section 1102.3, ammonia refrigeration systems are not regulated by this chapter. R-717 (ammonia) is included in this table because the table is extracted from ASHRAE 34 and is not capable of being modified. 8 LFL is based on WCF @ 73.4°F (23°C) unless otherwise noted. 9 WCFF LFL @ 140°F (60°C). 10 WCFF LFL @ 73.4°F (23°C). 11 WCF LFL @ 212°F (100°C).

  254 2025 CALIFORNIA MECHANICAL CODE

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  CALIFORNIA MECHANICAL CODE – MATRIX ADOPTION TABLE

  CHAPTER 12 – HYDRONICS

  (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.)

• CALGreen § 1106.2.6. Medium relevance — show source text

  (1) The space(s) containing the machinery is (are) separated from other occupancies by tight construction with tightfitting doors.

  (2) Access is restricted to authorized personnel.

  (3) Refrigerant detectors are installed with the sensing location and alarm level as required in refrigeration machinery rooms in accordance with Section 1106.2.6.

  (4) Open flames and surfaces exceeding 800°F (427°C) shall not be permitted where a Group A2, B2, A3, or B3 refrigerant, is used.

  (5) Electrical equipment that is in accordance with Class 1, Division 2, of NFPA 70 where the quantity of a Group A2, B2, A3, or B3 refrigerant in an independent circuit is capable of exceeding 25 percent of the lower flammability limit (LFL) upon release to the space based on the volume determined in accordance with Section 1104.2.1 through Section 1104.2.3.

  (6) Refrigerant containing parts in systems exceeding 100 horsepower (74.6 kW) compressor drive power, except evaporators used for refrigeration or dehumidification, condensers used for heating, control and pressure-relief valves for either, low-probability pumps, and connecting piping, are located in a machinery room or outdoors.

  [ASHRAE 15:7.2.2]

  1104.5 Flammable Refrigerants. The total of Group A2, B2, A3, and B3 refrigerants, other than Group A2L and B2L refrigerants shall not exceed 1100 pounds (498.9 kg) without approval by the Authority Having Jurisdiction. Institutional Occupancies shall comply with Section 1104.3. Machinery rooms required in accordance with Section 1106.0 based on flammability shall be constructed and maintained in accordance with Section 1106.2.1 through Section 1106.2.6 and Section 1106.11 for Group A2L and B2L refrigerants. 1104.6 Group A2L Refrigerants for Human Comfort. High-probability systems using Group A2L refrigerants for human comfort applications shall comply with this section.

  [ASHRAE 15:7.6]

  1104.6.1 Refrigerant Concentration Limits. Occupied spaces shall comply with the releasable charge limitations of the equipment listing and ASHRAE 15. Unoccupied spaces with refrigerant containing equipment, not including continuous piping or tubing, shall comply with the releasable charge limitations of the equipment listing or Section 1104.6.4. {ASHRAE 15:7.6.1-7.6.1.2}

  1104.6.2 Listing and Installation Requirements. Refrigeration systems shall be listed and shall be installed in accordance with listing, the manufacturer’s instructions, and any markings on the equipment restricting the installation. [ASHRAE 15:7.6.2]

  1104.6.2.1 Nameplate. The nameplate required by Section 1115.5 shall include a symbol indicating that a flammable refrigerant is used, as specified by the product listing. [ASHRAE 15:7.6.2.1]

  1104.6.2.2 Labeling. A label indicating a flammable refrigerant is used shall be placed adjacent to service ports and other locations where service involving components containing refrigerant is performed, as specified by the product listing.

• CALGreen § 1101.0 Medium relevance — show source text

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

  226 2025 CALIFORNIA MECHANICAL CODE

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

  CHAPTER 11

  REFRIGERATION

  1101.0 General.

  1101.1 Applicability. Part I governs the design, installation, and construction of refrigeration systems, equipment, refrigerant piping, pressure vessels, safety devices, replacement of parts, alterations, and substitution of different refrigerants. Part II governs the installation and construction of cooling

  towers.

  1101.2 Equipment. Equipment for refrigerant recovery, recycling, or both shall comply with UL 1963.

  Part I – Refrigeration Systems.

  1102.0 Refrigeration Systems.

  1102.1 General. Refrigeration systems using a refrigerant other than ammonia shall comply with this chapter and ASHRAE 15. Refrigeration systems containing carbon dioxide as the refrigerant shall also comply with IIAR CO2.

  1102.2 Ammonia Refrigeration Systems. Refrigeration systems using ammonia as the refrigerant shall comply with IIAR 2, IIAR 3, IIAR/ANSI 4, IIAR 5, and IIAR 6 and shall not be required to comply with this chapter.

  1102.3 Refrigerants. The refrigerant used shall be of a type listed in Table 1102.3 or in accordance with ASHRAE 34

  where approved by the Authority Having Jurisdiction.

  Exception: Lithium bromide absorption systems using water as the refrigerant.

  1103.0 Classification.

  1103.1 Classification of Refrigerants. Refrigerants shall be classified in accordance with Table 1102.3 or in accor dance with ASHRAE 34 where approved by the Authority Having Jurisdiction.

  1103.1.1 Safety Group. Table 1102.3 classifies refrigerants by toxicity and flammability, and assigns safety groups using combinations of toxicity class and flammability class. For the purposes of this chapter, the refrigerant Groups A1, A2L, A2, A3, B1, B2L, B2, and B3 shall be considered to be individual and distinct safety groups, as shown in Table 1103.1.1. Each refrigerant is assigned into not more than one group.

  TABLE 1103.1.1

  REFRIGERANT SAFETY GROUP CLASSIFICATIONS

  1103.2 Classification of Refrigeration Systems. Refrigeration systems shall be classified according to the degree of probability that a leakage of refrigerant will enter an occupancy-classified area in accordance with Section 1103.2.1 and Section 1103.2.2. [ASHRAE 15:5.2]

  1103.2.1 High-Probability System. Systems in which the basic design, or the location of components, is such that a leakage of refrigerant from a failed connection, seal, or component will enter the occupied space shall be classified as high-probability systems. A typical high-probability system shall be one of the following:

  (1) A direct system

• CALGreen § 1116.3 Medium relevance — show source text

  (2) Refrigeration systems containing Group R-22, not exceeding 5 tons of refrigeration capacity (18 kW), and field-piped using approved, factory-charged line sets shall be permitted to be proved tight by observing retention of pressure on a set of charging gauges and soaping connections while the system is operating.

  1116.3 Test Gases. Tests shall be performed with dry nitrogen or another nonflammable, nonreactive, dried gas. Oxygen, air, or mixtures containing them shall not be used. The means used to build up the test pressure shall have either a pressure limiting device or a pressure reducing device and a gauge on the outlet side. The pressure relief device shall be set above the test pressure but low enough to prevent permanent deformation of the system’s components.

  Exceptions:

  (1) Mixtures of dry nitrogen, inert gases, or a combination thereof such with Class 1 refrigerants in concentrations of a refrigerant weight fraction (mass fraction) not exceeding 5 percent shall be permitted for tests.

  (2) Mixtures of dry nitrogen, inert gases, or a combination thereof such with Class 2L, Class 2, and Class 3 refrigerants in concentrations not exceeding the lesser of a refrigerant weight fraction (mass fraction) of 5 percent or 25 percent of the LFL shall be permitted for tests.

  (3) Compressed air without added refrigerant shall be permitted for tests, provided the system is subsequently evacuated to less than 1000 microns (0.1333 kPa) before charging with refrigerant. The required evacuation level is atmospheric pressure for systems using R718 (water) or R-744 (carbon dioxide) as the refrigerant.

  (4) Systems erected on the premises using Group A1 refrigerant and with copper tubing not exceeding 0.62 of an inch (15.7 mm) outside diameter shall be tested by means of the refrigerant charged into the system at the saturated vapor pressure of the refrigerant at not less than 68°F (20°C). [ASHRAE 15:10.1.2]

  1116.4 Declaration. A dated declaration of test shall be

  provided for systems containing more than 55 pounds (24.9 kg) of refrigerant. The declaration shall give the name of the refrigerant and the field test pressure applied to the highside and the lowside of the system. The declaration of test shall be signed by the installer and, where an inspector is present at the tests, the inspector shall also sign the declaration. Where requested, copies of this declaration shall be furnished to the Authority Having Jurisdiction. [ASHRAE 15:10.2]

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  REFRIGERATION

  1116.5 Brine Systems. Brine-containing portions of a system shall be tested at one and a half times the design pressure of the system using brine as the test fluid.

  1117.0 Refrigerant-Containing Pressure Vessels.

  1117.1 Inside Dimensions 6 Inches or Less. Pressure vessels having inside dimensions of 6 inches (152 mm) or less shall be:

  (1) Listed either individually or as part of an assembly by an approved, nationally recognized testing laboratory, or

• CALGreen § 6.4 Medium relevance — show source text

  6.4_|||X|||||||||||||||||||||| |907.2.6.5|||X|||||||||||||||||||||| |907.2.9|||X|||||||||||||||||||||| |907.2.9.1|||X|||||||||||||||||||||| |907.2.9.3|||X|||||||||||||||||||||| |907.2.9.4|||X|||||||||||||||||||||| |907.2.9.4.1|||X|||||||||||||||||||||| |907.2.10|||X|||||||||||||||||||||| |907.2.11|||X|||||||||||||||||||||| |907.2.11.1|||X|||||||||||||||||||||| |907.2.11.2|||X|||||||||||||||||||||| |907.2.11.2.1 – 907.2.11.2.6|||X|||||||||||||||||||||| |907.2.11.3|||X|||||||||||||||||||||| |907.2.11.4|||X|||||||||||||||||||||| |907.2.11.6|||X|||||||||||||||||||||| |907.2.11.8|||X|||||||||||||||||||||| |907.2.11.9|||X|||||||||||||||||||||| |907.2.12|||X|||||||||||||||||||||| |907.2.13|||X|||||||||||||||||||||| |907.2.13.1|||X|||||||||||||||||||||| |907.2.13.1.2|||X|||||||||||||||||||||| |907.2.24 with subsections|||X|||||||||||||||||||||| |907.2.25 with subsections|||X|||||||||||||||||||||| |907.2.26 with subsections|||X|||||||||||||||||||||| |907.2.27|||X||||||||||||||||||||||

  2025 CALIFORNIA BUILDING CODE 9-3

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

  CALIFORNIA BUILDING CODE – MATRIX ADOPTION TABLE

  CHAPTER 9 – FIRE PROTECTION AND LIFE SAFETY SYSTEMS—continued

• CALGreen § 140.4 Medium relevance — show source text

  E. Office, financial institution and library building spaces in Climate Zones 1 through 15. The space-conditioning system shall be a heat pump. F. Office, financial institution and library building spaces in Climate Zone 16 with cooling capacity less than 65,000 Btu/hr. The space-conditioning system shall be an air conditioner with furnace. G. Office, financial institution and library building spaces in Climate Zone 16 with cooling capacity 65,000 Btu/hr or greater. The space-conditioning system shall be a dual-fuel heat pump. H. Office spaces in warehouses. The space-conditioning system shall be a heat pump in all climate zones. 3. Multi-zone space-conditioning system types. Space-conditioning systems in office buildings and school buildings not covered by Section 140.4(a)2 shall meet the following requirements: Exception 1 to Section 140.4(a)3 : Buildings greater than 150,000 square feet or greater than five (5) habitable stories. Exception 2 to Section 140.4(a)3 : School buildings in Climate Zones 6 and 7. A. Space-conditioning systems shall comply with one of the following: i. The space-conditioning system shall be a variable refrigerant flow (VRF) heat pump system that incorporates refrigerant-loop heat recovery and with a dedicated outdoor air system (DOAS) providing ventilation to all zones served by the space-conditioning system. Indoor fans shall meet the requirements of Section 140.4(a)3D. The DOAS shall comply with Section 140.4(a)3E. ii. The space-conditioning system shall be four-pipe fan coil (FPFC) terminal units with a DOAS providing ventilation to all zones served by the space-conditioning system. The FPFC hot water coils shall be supplied by an airto-water heat pump (AWHP) space-heating hot water loop that complies with Section 140.4(a)3C. Indoor fans shall meet the requirements of Section 140.4(a)3D. The DOAS shall comply with Section 140.4(a)3E. iii. For office buildings in all climate zones and school buildings in Climate Zones 2, 4 and 8 through 16, the spaceconditioning system shall be a variable air volume (VAV) system that utilizes heating supplied through a hot water loop served by an AWHP that complies with Section 140.4(a)3C and the following: a. For office buildings: I. The portion of perimeter zone terminal unit heating capacity utilizing parallel fan-powered boxes complying with Section 140.4(a)3E shall be:

  1. One hundred percent in Climate Zones 1 through 6 and 16.
  2. Twenty-five percent in Climate Zones 7 through 15. II. Ventilation systems in Climate Zones 1, 3, and 5 shall be equipped with a heat recovery system in compliance with Section 140.4(q). III. The maximum allowed fan power in Climate Zones 3 and 5 shall be 15 percent lower than specified by Section 140.4(c)1. b. For school buildings: I. All perimeter zone terminal units shall be parallel fan-powered boxes complying with Section 140.4(a)3E.
• CALGreen § 8.10.4 Medium relevance — show source text

  [ASHRAE 15:8.10.4] 1109.6 Support. In addition to the requirements of Section 1105.2, piping and tubing shall be securely fastened to a permanent support within 6 feet (1829 mm) following the first bend in such tubing from the compressor and within 2 feet (610 mm) of each subsequent bend or angle. Piping and tubing shall be supported at points not more than 15 feet (4572 mm) apart. 1109.7 Pipe Enclosure. Refrigerant piping and tubing shall be installed so that it is not subject to damage from an external source. Soft annealed copper tubing shall not exceed 1 [3] ⁄ 8 inches (35 mm) nominal size. Mechanical joints, other than approved press-connect joints, shall not be made on tubing exceeding [3] ⁄ 4 of an inch (20 mm) nominal size. Soft annealed copper tubing conveying refrigerant shall be enclosed in iron or steel piping and fittings, or in conduit, molding, or raceway that will protect the tubing against mechanical injury from an exterior source.

  2025 CALIFORNIA MECHANICAL CODE 239

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

  REFRIGERATION

  Exceptions: (1) Tubing entirely within or tubing within 5 feet (1524 mm) of a refrigerant compressor where so located that it is not subject to external injury. (2) Copper tubing serving a dwelling unit, where such tubing contains Group A1 refrigerant and is placed in locations not subject to damage from an external source. 1109.8 Visual Inspection. Refrigerant piping and joints erected on the premises shall be exposed to view for visual inspection prior to being covered or enclosed. Exception: Copper tubing enclosed in iron or steel piping conduit, molding, or raceway, provided there are no fittings or joints concealed therein. 1109.9 Condensation. Piping and fittings that convey brine, refrigerant, or coolants that during normal operation are capable of reaching a surface temperature below the dew point of the surrounding air and that are located in spaces or areas where condensation will cause a hazard to the building occupants or damage to the structure, electrical or other equipment shall be protected to prevent such damage. 1109.10 Identification. Piping shall be in accordance with the reference standard for identification. The type of refrigerant, function and pressure shall be indicated.

  1110.0 Valves.

  1110.1 More than 6.6 Pounds of Refrigerant. Systems containing more than 6.6 pounds (2.99 kg) of refrigerant shall have stop valves installed at the following locations: (1) The suction inlet of each compressor, compressor unit, or condensing unit. (2) The discharge of each compressor, compressor unit, or condensing unit. (3) The outlet of each liquid receiver. Exceptions: (1) Systems that have a refrigerant pumpout function capable of storing the entire refrigerant charge. (2) Systems that are equipped with the provisions for pumpout of the refrigerant. (3) Self-contained systems. [ASHRAE 15:9.12.4] **1110.2 More than 110 Pounds of Refrigerant.

• CALGreen § 1107.1.7.1 Medium relevance — show source text

  1107.1.7.1 Mechanical Ventilation. The mechanical ventilation system in the machinery room is run continuously in accordance with Section 1106.11.6.1 and failure of the mechanical ventilation system actuates an alarm, or the mechanical ventilation system in the machinery room is activated by one or more refrigerant detectors, in accordance with the requirements of Section 1106.11.11.

  1107.1.7.2 Refrigeration Detectors. For the refrigerant detection required in Section 1106.2.5, detection of refrigerant concentration that exceeds 25 percent of the LFL or the upper detection limit of the refrigerant detector, whichever is lower, shall automatically de-energize the following equipment in the machinery room:

  (1) refrigerant compressors

  (2) refrigerant pumps

  (3) normally-closed automatic refrigerant valves

  1107.1.7.3 Machinery Rooms. The machinery room shall comply with Section 1106.11. 1107.1.8 Group A2, A3, B2, or B3 Refrigerants. Where any refrigerant of Groups A2, A3, B2, or B3 are used, the machinery room shall comply with Class 1, Division 2, of of the California Electrical Code .

  1107.1.9 Refrigeration Systems. As part of the mechanical ventilation system in accordance with Section 1106.2.8, refrigeration systems that contain more

  than 110 pounds (50 kg) of any Group A2L, A2, A3, B2L, B2, or B3, refrigerant shall have not less than one exhaust air inlet located adjacent to each system not more than 9 feet (3 m) away.

  1107.1.10 Remote Control. Remote control of the

  mechanical equipment in the refrigeration machinery room shall be provided immediately outside the machinery room door solely for the purpose of shutting down the equipment in an emergency. Ventilation fans shall be on a separate electrical circuit and have a control switch located immediately outside the machinery room door.

  1108.0 Refrigeration Machinery Room Equipment and Controls.

  1108.1 General. Equipment, piping, ducts, vents, or similar devices that are not essential for the refrigeration process, maintenance of the equipment, or for the illumination, ventilation, or fire protection of the room shall not be placed in or pass through a refrigeration machinery room.

  1108.2 Electrical. Electrical equipment and installations shall comply with California Electrical Code . The refrigeration machinery room shall not be classified as a hazardous location except as provided in Section 1107.1.7 or Section 1107.1.8.

  1108.3 Emergency Shutoff. A clearly identified emergency shutoff switch of the break-glass type or with an approved tamper-resistant cover shall be provided immediately adjacent to and outside of the principal refrigeration machinery room entrance. The switch shall provide off-only control of refrigerant compressors, refrigerant pumps, and normally-closed automatic refrigerant valves located in the machinery room. For other than A1 and B1 refrigerants, emergency shutoff shall be automatically activated by refrigerant Alarm 2 in accordance with Section 1106.2.5.

• CALGreen § 608.1 Medium relevance — show source text

  SECTION 608—MECHANICAL REFRIGERATION

  [M] 608.1 Scope. Refrigeration systems shall be installed in accordance with the California Mechanical Code .

  608.1.1 Refrigerants other than ammonia. Where a refrigerant other than ammonia is used, refrigeration systems and the buildings in which such systems are installed shall be in accordance with ASHRAE 15.

  608.1.2 Ammonia refrigeration. Refrigeration systems using ammonia refrigerant and the buildings in which such systems are installed shall comply with IIAR 2 for system design; IIAR 6 for inspection, testing and maintenance; and IIAR 7 for operating procedures. Decommissioning of ammonia refrigeration systems shall comply with IIAR 8, and engineering practices for existing ammonia refrigeration systems shall be in accordance with IIAR 9.

  608.2 Permits. An operational permit shall be obtained for refrigeration systems as set forth in Section 105.5.46.

  [M] 608.3 Refrigerants. The use and purity of new, recovered and reclaimed refrigerants shall be in accordance with the California Mechanical Code .

  [M] 608.4 Refrigerant classification. Refrigerants shall be classified in accordance with the California Mechanical Code .

  [M] 608.5 Change in refrigerant type. A change in the type of refrigerant in a refrigeration system shall be in accordance with the California Mechanical Code .

  608.6 Access. Access to refrigeration systems having a refrigerant circuit containing more than 220 pounds (100 kg) of Group A1 or 30 pounds (14 kg) of any other group refrigerant shall be provided for the fire department at all times as required by the fire code official.

  608.7 Testing of equipment. Refrigeration equipment and systems having a refrigerant circuit containing more than 220 pounds (100 kg) of Group A1 or 30 pounds (14 kg) of any other group refrigerant shall be subject to periodic testing in accordance with Section 608.7.1. Records of tests shall be maintained. Tests of emergency devices or systems required by this chapter shall be conducted by persons trained and qualified in refrigeration systems.

  6-10 2025 CALIFORNIA FIRE CODE

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

  BUILDING SERVICES AND SYSTEMS

  608.7.1 Periodic testing. The following emergency devices or systems shall be periodically tested in accordance with the manufacturer’s instructions and as required by the fire code official.

  1. Treatment and flaring systems.
  2. Valves and appurtenances necessary to the operation of emergency refrigeration control boxes.
  3. Fans and associated equipment intended to operate emergency ventilation systems.
  4. Detection and alarm systems.

  608.8 Emergency signs. Refrigeration units or systems having a refrigerant circuit containing more than 220 pounds (100 kg) of Group A1 or 30 pounds (14 kg) of any other group refrigerant shall be provided with approved emergency signs, charts and labels in accordance with NFPA 704. Hazard signs shall be in accordance with the California Mechanical Code for the classification of refrigerants listed therein.

  608.9 Refrigerant detection. Machinery rooms shall be provided with a refrigerant detector with an audible and visible alarm. Where ammonia is used as the refrigerant, detection shall comply with IIAR 2. For refrigerants other than ammonia, refrigerant detection shall comply with Section 608.9.1.