Which voluntary measures are listed (daylight power adjustments, exhaust-air heat recovery, service water heating)?

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

• CBC § 601.3.4 High relevance — show source text

  A5.601.3.4 Voluntary measures for Tier 2. In addition to the provisions of Sections A5.601.3.1 and A5.601.3.3 above, compliance with the following voluntary measures from Appendix A5 is required for Tier 2:

  1. From Division A5.1, a. Comply with the designated parking requirements for fuel efficient vehicles for a minimum of 50 percent of parking capacity per Section A5.106.5.1. b. Electric vehicle (EV) charging [N] and Table A5.106.5.3.2 with footnotes. c. Comply with thermal emittance, solar reflectance or SRI values for cool roofs in Section A5.106.11.2 and Table A5.106.11.2.3. [1]

  d. Comply with three elective measures selected from this division.

  APPENDIX A5-42 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

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  APPENDIX A5 — NONRESIDENTIAL VOLUNTARY MEASURES

  2. From Division A5.2 comply with TWO of the following:

  3. Outdoor lighting as described in A5.203.1.1.1.

  4. Service water heating in restaurants as described in A5.203.1.1.2.

  5. Warehouse Dock Seal Doors A5.203.1.1.3.

  6. Daylight Design Power Adjustments 5.203.1.1.4.

  7. Exhaust Air Heat Recovery A5.203.1.1.5.

  8. From Division A5.3,

  a. Comply with the 20-percent reduction for indoor potable water use in Section A5.303.2.3.2. b. Comply with three elective measures selected from this division.

  4. From Division A5.4,

  a. Comply with recycled content of 15 percent of materials based on estimated total cost, or use two products from Table A5.405.4 for at least 75 percent by cost in Section A5.405.4.1. b. Comply with the 80-percent reduction in construction and demolition waste in Section A5.408.3.1. c. Comply with three elective measures selected from this division.

  5. From Division A5.5,

  a. Comply with resilient flooring systems for 100 percent of resilient flooring in Section A5.504.4.7.1. Exception: Allowance may be permitted in Tier 2 for up to 5-percent specialty purpose flooring. b. Comply with thermal insulation meeting 2009 CHPS low-emitting materials list and no added formaldehyde in Section A5.504.4.8.1.

  c. Comply with three elective measures selected from this division. 6. Comply with three additional elective measures selected from any division.

  1 Cool roof is required for compliance with Tiers 1 and 2 and may be used to meet energy standards in Part 6, exceed energy standards and to mitigate heat island effect.

  A5.601.4 Compliance verification. Compliance with Section A5.601.2 or A5.601.3 shall be as required in Chapter 7 of this code. Compliance documentation shall be made part of the project record as required in Section 5.410.2 or 5.410.3.

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A5-43

• CBC § 405.4 High relevance — show source text

  4. From Division A5.4,

  a. Comply with recycled content of 10 percent of materials based on estimated total cost, or use two products from Table A5.405.4 for at least 75 percent by cost in Section A5.405.4. b. Comply with the 65-percent reduction in construction and demolition waste in Section A5.408.3.1. c. Comply with one elective measure selected from this division.

  5. From Division A5.5,

  a. Comply with resilient flooring systems for 90 percent of resilient flooring in Section A5.504.4.7. b. Comply with thermal insulation meeting 2009 CHPS low-emitting materials list in Section A5.504.4.8. c. Comply with one elective measure selected from this division. 6. Comply with one additional elective measure selected from any division.

  1 Cool roof is required for compliance with Tiers 1 and 2 and may be used to meet energy standards in Part 6, exceed energy standards and to mitigate heat island effect.

  A5.601.3 CALGreen Tier 2.

  A5.601.3.1 Prerequisites. To achieve CALGreen tier status, a project must meet all of the mandatory measures in Chapter 5 and, in addition, meet the provisions of this section.

  A5.601.3.2 Energy performance. For the purposes of mandatory energy efficiency standards in this code, the California Energy Commission will continue to adopt mandatory standards.

  A5.601.3.3 Tier 2. Comply with the energy efficiency requirements in Section A5.203.1.1 and Section A5.203.1.2.2.

  A5.601.3.4 Voluntary measures for Tier 2. In addition to the provisions of Sections A5.601.3.1 and A5.601.3.3 above, compliance with the following voluntary measures from Appendix A5 is required for Tier 2:

  1. From Division A5.1, a. Comply with the designated parking requirements for fuel efficient vehicles for a minimum of 50 percent of parking capacity per Section A5.106.5.1. b. Electric vehicle (EV) charging [N] and Table A5.106.5.3.2 with footnotes. c. Comply with thermal emittance, solar reflectance or SRI values for cool roofs in Section A5.106.11.2 and Table A5.106.11.2.3. [1]

  d. Comply with three elective measures selected from this division.

  APPENDIX A5-42 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

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  APPENDIX A5 — NONRESIDENTIAL VOLUNTARY MEASURES

  2. From Division A5.2 comply with TWO of the following:

  3. Outdoor lighting as described in A5.203.1.1.1.

  4. Service water heating in restaurants as described in A5.203.1.1.2.

  5. Warehouse Dock Seal Doors A5.203.1.1.3.

  6. Daylight Design Power Adjustments 5.203.1.1.4.

  7. Exhaust Air Heat Recovery A5.203.1.1.5.

  8. From Division A5.3,

• CBC § 203.1.1.2 High relevance — show source text

  9. In theme parks: outdoor lighting only for themes and special effects.
  10. Lighting for outdoor theatrical and other outdoor live performances, provided that these lighting systems are additions to area lighting systems and are controlled by a multi-scene or theatrical cross-fade control station accessible only to authorized operators.
  11. Outdoor lighting systems for qualified historical buildings, as defined in the California Historical Building Code (Title 24, Part 8), if they consist solely of historical lighting components or replicas of historical lighting components. If lighting systems for qualified historical buildings contain some historical lighting components or replicas of historical components combined with other lighting components, only those historical or historical replica components are exempt. All other outdoor lighting systems for qualified historical buildings shall not be exempted.

  A5.203.1.1.2 Service water heating in restaurants. Newly constructed restaurants 8,000 square feet or greater and with service water heaters rated 75,000 Btu/h or greater shall install a solar water-heating system with a minimum solar savings fraction of 0.15.

  Exceptions:

  1. Buildings with a natural gas service water heater with a minimum of 95-percent thermal efficiency.
  2. Buildings where greater than 75 percent of the total roof area has annual solar access that is less than 70 percent. Solar access is the ratio of solar insolation, including shade, to the solar insolation without shade. Shading from obstructions located on the roof or any other part of the building shall not be included in the determination of annual solar access.

  A5.203.1.1.3 Warehouse dock seal doors. Exterior loading dock doors that are adjacent to conditioned or indirectly conditioned spaces shall have dock seals or dock shelters installed at the time of permitting. This requirement shall apply to newly constructed buildings and to loading dock doors added to existing buildings.

  A5.203.1.1.4 Daylight Design Power Adjustments Factors (PAFs). Daylighting devices shall be installed as specified in Title 24, Part 6, Section 140.3(d).

  A5.203.1.1.5 Exhaust air heat recovery. Heat recovery requirements based on ASHRAE 90.1, Section 6.5.6.1 are adapted and modified for California climate zones as described below.

  1. Systems with minimum design outdoor air fraction of 80 percent or greater and supply air flow of 200 cfm or greater in climate zones 2, 9, 10, 11, 12, 13, 14, 15 shall have a heat recovery system.
  2. Heat recovery systems required by this section shall result in a net sensible energy recovery ratio of at least 60 percent for both heating and cooling as tested using AHRI 1060-2014 or 1061-2014 and certified by AHRI. A 60 percent sensible energy recovery ratio shall mean a change in the dry-bulb of the outdoor air supply equal to 60 percent of the difference between the outdoor air and exhaust air dry-bulb at design conditions. Provisions shall be made to bypass or control the energy recovery system to permit air economizer operation as required by Title 24, Part 6, Section 140.4(e), Economizers.

  Exceptions:

• CBC § 601.2.4 High relevance — show source text

  A5.601.2.4 Voluntary measures for Tier 1. In addition to the provisions of Sections A5.601.2.1 and A5.601.2.3 above, compliance with the following voluntary measures from Appendix A5 is required for Tier 1:

  1. From Division A5.1, a. Comply with the designated parking requirements for high-efficiency vehicles for a minimum of 35 percent of parking capacity per Section A5.106.5.1. b. Electric vehicle (EV) charging [N] and Table A5.106.5.3.1 w/ footnotes. c. Comply with thermal emittance, solar reflectance or SRI values for cool roofs in Section A5.106.11.2 and Table A5.106.11.2.2. [1]

  d. Comply with one elective measure selected from this division. 2. From Division A5.2 comply with ONE of the following:

  1. Outdoor lighting as described in A5.203.1.1.1.

  2. Service water heating in restaurants as described in A5.203.1.1.2.

  3. Warehouse Dock Seal Doors A5.203.1.1.3.

  4. Daylight Design Power Adjustments 5.203.1.1.4.

  5. Exhaust Air Heat Recovery A5.203.1.1.5.

  6. From Division A5.3,

  a. Comply with the 12-percent reduction for indoor potable water use in Section A5.303.2.3.1. b. Comply with one elective measure selected from this division.

  4. From Division A5.4,

  a. Comply with recycled content of 10 percent of materials based on estimated total cost, or use two products from Table A5.405.4 for at least 75 percent by cost in Section A5.405.4. b. Comply with the 65-percent reduction in construction and demolition waste in Section A5.408.3.1. c. Comply with one elective measure selected from this division.

  5. From Division A5.5,

  a. Comply with resilient flooring systems for 90 percent of resilient flooring in Section A5.504.4.7. b. Comply with thermal insulation meeting 2009 CHPS low-emitting materials list in Section A5.504.4.8. c. Comply with one elective measure selected from this division. 6. Comply with one additional elective measure selected from any division.

  1 Cool roof is required for compliance with Tiers 1 and 2 and may be used to meet energy standards in Part 6, exceed energy standards and to mitigate heat island effect.

  A5.601.3 CALGreen Tier 2.

  A5.601.3.1 Prerequisites. To achieve CALGreen tier status, a project must meet all of the mandatory measures in Chapter 5 and, in addition, meet the provisions of this section.

  A5.601.3.2 Energy performance. For the purposes of mandatory energy efficiency standards in this code, the California Energy Commission will continue to adopt mandatory standards.

  A5.601.3.3 Tier 2. Comply with the energy efficiency requirements in Section A5.203.1.1 and Section A5.203.1.2.2.

• CBC § 0.5 High relevance — show source text

  where:

  CCAP = Design capacity of all mechanical cooling systems. CHL = Coincident peak cooling load of all spaces with a design equipment power density > 5 watts/ft [2] and a minimum outdoor airflow requirement < 0.5 cfm/ft [2] (i.e., high load spaces).

  CLL = CCAP - CHL. If the design includes capacity for future cooling systems, then assume 20 percent of future systems serve high load spaces.

  SWHCAP = Design capacity of all service water heating (SWH) systems, excluding systems expected to operate less than 5 hours per week, such as instant-hot water systems for emergency eyewash stations.

  HCAP = Design capacity of all space-heating systems. B. The heat recovery system shall include a heat recovery chiller, or other means, capable of transferring the lesser of the following from spaces in cooling to spaces in heating and/or to the SWH system: i. 25 percent of the peak heat rejection of the cooling system. ii. 25 percent of (SWHCAP + HCAP) Exception 1 to Section 140.4(s)1: Laboratory buildings with exhaust air heat recovery systems meeting Section 140.9(c)6. Exception 2 to Section 140.4(s)1: Buildings in Climate Zone 15 with SWHCAP < 600 kBtuh. 2. Heat recovery for service water heating. If the building is required to have simultaneous mechanical heat recovery by Section 140.4(s)1, and SWHCAP ≥ 500 kBtuh, then the heat recovery system shall also heat or preheat the service hot water. The heat recovery system shall have the capacity to transfer the smaller of: A. 30 percent of the peak heat rejection of the cooling system; or B. 30 percent of SWHCAP.

  Exception to Section 140.4(s): Buildings with a computer room heat recovery system or wastewater heat recovery system capable of providing not less than 25 percent of SWHCAP + HCAP.

  Note: Authority: Sections 25213, 25218, 25218.5, 25402 and 25402.1, Public Resources Code. Reference: Sections 25007, 25008, 25218.5, 25310, 25402, 25402.1, 25402.4, 25402.8, and 25943, Public Resources Code .

  SECTION 140.5—PRESCRIPTIVE REQUIREMENTS FOR SERVICE WATER-HEATING SYSTEMS

  (a) Nonresidential occupancies. Service water-heating systems in nonresidential buildings shall meet the requirements of 1 or 2 below, or meet the performance compliance requirements of Section 140.1:

  1. School buildings less than 25,000 square feet and less than 4 stories in Climate Zones 2 through 15. A heat pump water-heating system that meets the applicable requirements of Sections 110.1, 110.3 and 120.3.

  Exception to Section 140.5(a)1: A water-heating system serving an individual bathroom space may be an instantaneous electric water heater.

  2. All other occupancies. A service water-heating system that meets the applicable requirements of Sections 110.1, 110.3, 120.3 and 140.5(c).

  (b) Hotel/motel occupancies. A service water-heating system installed in hotel/motel buildings shall meet the requirements of Section 170.2(d).

• CBC § 409.4 High relevance — show source text

  Solar access is the ratio of solar insolation including shade to the
  solar insolation without shade. Shading from obstructions located on the roof or any other part of the building shall not be included in the determination of annual solar access.
  3.
  Life cycle assessment compliant with Section A5.409.4 in this code may be substituted for prescriptive measures from Division A5.4.|

  A5.601.1 Scope. The measures contained in this appendix are not mandatory unless adopted by local government as specified in Section 101.7. The provisions of this section outline means of achieving enhanced construction or reach levels by incorporating addi

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A5-41

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  APPENDIX A5 — NONRESIDENTIAL VOLUNTARY MEASURES

  tional green building measures for newly constructed nonresidential buildings as well as additions and alterations. In order to meet one of the tier levels designers, builders or property owners are required to incorporate additional green building measures necessary to meet the threshold of each level. Refer to the provisions in Section 301.3 for nonresidential additions and alterations scope and application.

  A5.601.2 CALGreen Tier 1

  A5.601.2.1 Prerequisites. To achieve CALGreen tier status, a project must meet all of the mandatory measures in Chapter 5 and, in addition, meet the provisions of this section.

  A5.601.2.2 Energy performance. For the purposes of mandatory energy efficiency standards in this code, the California Energy Commission will continue to adopt mandatory standards.

  A5.601.2.3 Tier 1. Comply with the energy efficiency requirements in Section A5.203.1.1 and Section A5.203.1.2.1.

  A5.601.2.4 Voluntary measures for Tier 1. In addition to the provisions of Sections A5.601.2.1 and A5.601.2.3 above, compliance with the following voluntary measures from Appendix A5 is required for Tier 1:

  1. From Division A5.1, a. Comply with the designated parking requirements for high-efficiency vehicles for a minimum of 35 percent of parking capacity per Section A5.106.5.1. b. Electric vehicle (EV) charging [N] and Table A5.106.5.3.1 w/ footnotes. c. Comply with thermal emittance, solar reflectance or SRI values for cool roofs in Section A5.106.11.2 and Table A5.106.11.2.2. [1]

  d. Comply with one elective measure selected from this division. 2. From Division A5.2 comply with ONE of the following:

  1. Outdoor lighting as described in A5.203.1.1.1.

  2. Service water heating in restaurants as described in A5.203.1.1.2.

  3. Warehouse Dock Seal Doors A5.203.1.1.3.

  4. Daylight Design Power Adjustments 5.203.1.1.4.

  5. Exhaust Air Heat Recovery A5.203.1.1.5.

  6. From Division A5.3,

  a. Comply with the 12-percent reduction for indoor potable water use in Section A5.303.2.3.1. b. Comply with one elective measure selected from this division.

  4. From Division A5.4,
• CBC § 0.4 High relevance — show source text

  (1) For energy recovery systems where the transfer of energy cannot be stopped, bypass provision shall prevent the total airflow rate of either outdoor air or exhaust air through the energy recovery exchanger from exceeding 10 percent of the full design airflow rate.

  (2) The pressure drop of the outdoor air through the energy recovery exchanger shall not exceed 0.4 in. of water (100 Pa); the pressure drop of the exhaust air through the energy recovery exchanger shall not exceed 0.4 in. of water (100 Pa).

  Exception: Energy recovery systems with 80 percent or more outdoor air at full design airflow rate and not exceeding 10 000 CFM (4.72 m [3] /s).

  [ASHRAE 90.1:6.5.6.1.2.2] E 503.5.10.2 Heat Recovery for Service Water Heating. Heat recovery shall comply with Section E 503.5.10.2.1 and Section E 503.5.10.2.2.

  E 503.5.10.2.1 Condenser Heat Recovery Systems. Condenser heat recovery systems shall be installed for the heating or preheating of service hot water where all of the following conditions exist:

  (1) The facility operates 24 hours a day.

  (2) The total installed heat rejection capacity of the water-cooled system is more than 6 000 000 Btu/h (1757 kW) of heat rejection.

  (3) The design service water heating load is more than 1 000 000 Btu/h (293 kW).

  [ASHRAE 90.1:6.5.6.2.1] E 503.5.10.2.2 Capacity. The required heat recovery system shall have the capacity to provide the smaller of:

  (1) Sixty percent of the peak heat-rejection load at design conditions or

  (2) Preheat of the peak service hot-water draw to 85°F (29°C).

  Exceptions:

  (1) Facilities that employ condenser heat recovery for space heating with a heat recovery

  444 2025 CALIFORNIA MECHANICAL CODE

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

  APPENDIX E

  TABLE E 503.5.11.2.1 MAXIMUM NET EXHAUST FLOW RATE, CFM PER LINEAR FOOT OF HOOD LENGTH

  [ASHRAE 90.1: TABLE 6.5.7.2.2]

  TYPE OF HOOD	LIGHT DUTY EQUIPMENT	MEDIUM DUTY EQUIPMENT	HEAVY DUTY EQUIPMENT	EXTRA HEAVY DUTY EQUIPMENT
  Wall-mounted canopy	140	210	280	385
  Single island	280	350	420	490
  Double island (per side)	175	210	280	385
  Eyebrow	175	175	Not allowed	Not allowed
  Backshelf/ Pass-over	210	210	280	Not allowed

  For SI units: 1 foot = 304.8 mm, 1 cubic foot per minute = 0.00047 m [3] /s

• CBC § 203.1.2.1 High relevance — show source text

  In addition, a minimum of two of
  the efficiency measures specified in Sections A4.203.1.2.1 through
  A4.203.1.2.8 will be required to be met.
  · Roof Deck Insulation or Ducts in Conditioned Space.
  · High-performance Walls.
  · Compact Hot Water Distribution System.
  · Drain Water Heat Recovery.
  · High Performance Vertical Fenestration.
  · Heat Pump Water Heater Demand Management.
  · Battery Storage System Controls.
  · **Heat Pump Space and Water Heating.||2|2|||| |**A4.203.1.3 Consultation with local electric service provider.**Local
  jurisdictions considering adoption of reduced EDR targets based on
  using solar photovoltaic (PV) systems larger than required by the
  California Energy Code shall consult with the local electric service
  provider to ensure that that PV system sizing required to comply with
  the EDR targets will be acceptable to the local electric service
  provider.||2|2||||

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-25

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  APPENDIX A4 — RESIDENTIAL VOLUNTARY MEASURES

  SECTION A4.602—RESIDENTIAL OCCUPANCIES APPLICATION CHECKLIST—continued

  FEATURE OR MEASURE	LEVELS APPLICANT TO SELECT ELECTIVE MEASURES	Col3	Col4	VERIFICATIONS ENFORCING AGENCY TO SPECIFY VERIFICATION METHOD	Col6	Col7
  FEATURE OR MEASURE	Mandatory	Prerequisites and electives1	Prerequisites and electives1	Enforcing Agency  All	Installer or Designer  All	Third party  All
  FEATURE OR MEASURE	Mandatory	Tier 1	Tier 2	Tier 2	Tier 2	Tier 2
  WATER EFFICIENCY AND CONSERVATION
  Indoor Water Use
  4.303.1Plumbing fixtures (water closets and urinals) and fittings (showerheads, faucets and pre-rinse spray valves) installed in residential buildings shall comply with the prescriptive requirements of Sections 4.303.1.1 through 4.303.1.4.5.						
  4.303.2 Submeters for multifamily building and dwelling units in **mixed-use residential/commercial buildings.

• CBC § 160.2 High relevance — show source text

  The ventilation rate required by the authority having jurisdiction, the facility Environmental Health and Safety Department or Section 160.2(c)3; or

  iii. The mechanical exhaust flow minus the available transfer air. Available transfer air shall be from another conditioned space or return air plenums on the same floor and same smoke or fire compartment, and that at their closest point are within 15 feet of each other. Exception 1 to Section 170.2(c)4M: Spaces that are required by applicable codes and standards to be maintained at a positive pressure differential relative to adjacent spaces. Exception 2 to Section 170.2(c)4M: Spaces where the highest amount of transfer air that could be used for exhaust makeup may exceed the available transfer airflow rate and where the spaces have a required negative pressure relationship. N. Dedicated outdoor air systems (DOAS). HVAC systems that utilize a dedicated outdoor air system (DOAS) such as a DX-DOAS, HRV or ERV unit to condition, temper or filter 100 percent outdoor air separate from local or central spaceconditioning systems serving the same space shall meet the following criteria:

  1. DOAS unit fan systems with input power less than 1 kW shall not exceed a total combined fan power of 1.0 W/cfm. DOAS with fan power greater than or equal to 1 kW shall meet the requirements of Section 140.4(c).
  2. The DOAS supply air shall be delivered directly to the occupied space or at the outlet of any terminal heating or cooling coils and shall cycle off any zone heating and cooling equipment fans, circulation pumps and terminal unit fans when there is no call for heating or cooling in the zone. Exception 1 to Section 170.2(c)4N2: Active chilled beam systems. Exception 2 to Section 170.2(c)4N2: Sensible-only cooling terminal units with pressure-independent variableairflow regulating devices limiting the DOAS supply air to the greater of latent load or minimum ventilation requirements. Exception 3 to Section 170.2(c)4N2: Any configuration where a DOAS unit provides ventilation air to a downstream fan (a terminal box, air handling unit or other space-conditioning equipment) where the total system airflow can be reduced to ventilation minimum or the downstream fan power is no greater than 0.12 watts per cfm when space temperatures are within the thermostat deadband (at low speed per manufacturer’s literature).
  3. DOAS supply and exhaust fans shall have a minimum of three speeds to facilitate system balancing.
  4. DOAS with mechanical cooling providing ventilation to multiple zones and operating in conjunction with zone heating and cooling systems shall not use heating or heat recovery to warm supply air above 60°F when representative building loads or outdoor air temperature indicates that the majority of zones requires cooling.

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  MULTIFAMILY BUILDINGS—PERFORMANCE AND PRESCRIPTIVE COMPLIANCE APPROACHES

  O. Exhaust air heat recovery. Fan systems designed to operate to the criteria listed in either Table 170.2-I or Table 170.2-J shall include an exhaust air heat recovery system that meets the following: i. A sensible energy recovery ratio of at least 60 percent or an enthalpy recovery ratio of at least 50 percent for both heating and cooling design conditions. ii. Energy recovery bypass or control to disable energy recovery and to directly economize with ventilation air based on outdoor air temperature limits specified in Table 170.2-G.

• CBC § 503.5.11.3 High relevance — show source text

  A + B - ( E/M ) ≥ 50% (Equation E 503.5.11.3)

  Where:

  A = Percentage that the exhaust and makeup airflow rates are capable of being reduced from design conditions.

  B = Sensible energy recovery ratio.

  E = Exhaust airflow rate through the heat recovery device at design conditions.

  M = Makeup airflow rate of the system at design conditions.

  (2) VAV laboratory exhaust and room supply systems that are required to have minimum circulation rates to be in accordance with the codes or

  accreditation standards shall be capable of and configured to reduce zone exhaust and makeup airflow rates to the regulated minimum circulation values, or the minimum required to maintain pressurization relationship requirements. Systems serving nonregulated zones shall be capable of and configured to reduce exhaust and makeup airflow rates to 50 percent of the zone design values, or the minimum required to maintain pressurization relationship requirements.

  (3) Direct makeup (auxiliary) air supply of 75 percent or more of the exhaust airflow rate, heated not more than 2°F (1°C) below room setpoint, cooled to not less than 3°F (2°C) above room setpoint, no humidification added, and no simultaneous heating and cooling are used for dehumidification control. [ASHRAE 90.1:6.5.7.3]

  E 503.5.12 Radiant Heating Systems. Radiant heating systems shall be in accordance with Section E 503.5.12.1 through Section E 503.5.12.2.

  E 503.5.12.1 Heating Unenclosed Spaces. Radiant heating shall be used when heating is required for unenclosed spaces.

  Exception: Loading docks equipped with air curtains. [ASHRAE 90.1:6.5.8.1]

  446 2025 CALIFORNIA MECHANICAL CODE

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

  APPENDIX E

  to permit a determination of compliance by the building official and to indicate compliance with the requirements of this appendix. [ASHRAE 90.1:4.2.2.1] E 503.6.2 Supplemental Information. Supplemental information necessary to verify compliance with this appendix, such as calculations, worksheets, compliance forms, vendor literature, or other data, shall be made available where required by the Authority Having Jurisdiction. [ASHRAE 90.1:4.2.2.2]

  E 503.6.3 Manuals. Operating and maintenance information shall be provided to the building owner. This information shall include, but not be limited to, the information specified in Section E 503.6.3.1, Section E 503.6.3.2, and Section E 503.6.5.2. [ASHRAE 90.1:4.2.2.3]

  E 503.6.3.1 Required Information. Construction documents shall require that an operating manual and maintenance manual be provided to the building owner. The manuals shall include, at a minimum, the following:

  (1) Submittal data stating equipment rating and selected options for each piece of equipment requiring maintenance.

  (2) Operation manuals and maintenance manuals for each piece of equipment requiring maintenance. Required routine maintenance actions shall be clearly identified.

  (3) Names and addresses of not less than one qualified service agency.

• CBC § 90.1 High relevance — show source text

  APPENDIX E

  design exceeding 30 percent of the peak water-cooled condenser load at design conditions.

  (2) Facilities that provide 60 percent of their service water heating from on-site-renewable energy or site-recovered energy or from other sources. [ASHRAE 90.1:6.5.6.2.2]

  E 503.5.10.3 Heat Recovery for Space Con- ditioning. Where heating water is used for space heating, a condenser heat recovery system shall be installed, provided all of the following are true:

  (1) The building is an acute inpatient hospital, where the building or portion of a building is used on a 24-hour basis for the inpatient medical, obstetric, or surgical care for patients.

  (2) The total design chilled-water capacity for the acute inpatient hospital, either air cooled or water cooled, required at cooling design conditions exceeds 3 600 000 Btu/h (1055 kW) of cooling.

  (3) Simultaneous heating and cooling occurs above 60°F (16°C) outdoor air temperature. The required heat recovery system shall have a cooling capacity that is at least 7 percent of the total design chilled-water capacity of the acute inpatient hospital at peak design conditions.

  [ASHRAE 90.1:6.5.6.3]

  E 503.5.10.4 Indoor Pool Dehumidifier Energy Recovery. An indoor pool dehumidifier serving a natatorium with a heated indoor pool over 500 ft [2] (46.45 m [2] ) in size shall include one of the following:

  (1) An exhaust air sensible energy recovery system with a sensible energy recovery ratio of at least 50 percent.

  (2) A condenser heat recovery system capable of and configured to use 100 percent of the heat generated through dehumidification to heat the pool water when there is a pool water heating load.

  (3) An exhaust air energy recovery system that results in an enthalpy recovery ratio of at least 50 percent. [ASHRAE 90.1:6.5.6.4]

  E 503.5.11 Exhaust Systems. Exhaust systems shall comply with Section E 503.5.11.1 through Section E 503.5.11.3.

  E 503.5.11.1 Transfer Air. Conditioned supply air delivered to a space with a mechanical exhaust shall not exceed the greater of the following:

  (1) The supply flow required to be in accordance with the space heating or cooling load;

  (2) The ventilation rate required by the Authority Having Jurisdiction, the Facility Environmental Health and Safety department, Chapter 4 or ASHRAE 62.1; or

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• CBC § 209.1.7 High relevance — show source text

  If the device is placed in calibration mode, automatically restore its time delay settings to normal operation programmed time delays after no more than 60 minutes; and 5. Have a setpoint control that easily distinguishes settings to within 10 percent of full scale adjustment; and 6. Have a light sensor that has a linear response with 5 percent accuracy over the range of illuminance measured by the light sensor; and 7. Have a light sensor that is physically separated from where calibration adjustments are made or is capable of being calibrated in a manner that the person initiating calibration is remote from the sensor during calibration to avoid influencing calibration accuracy. A6.209.1.7 Interior photosensors. Interior photosensor shall not have a mechanical slide cover or other device that permits easy unauthorized disabling of the control and shall not be incorporated into a wall-mounted occupant-sensor. A6.209.1.8 Multilevel astronomical time-switch controls. Multilevel astronomical time-switch controls used to control lighting in daylit zones shall:

  1. Contain at least two separately programmable steps per zone that reduces illuminance in a relatively uniform manner as specified in Section A6.209.2.2; and
  2. Have a separate offset control for each step of 1 to 240 minutes; and
  3. Have sunrise and sunset prediction accuracy within +/- 15 minutes and timekeeping accuracy within 5 minutes per year; and

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A6.1-23

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

  APPENDIX A6.1 — VOLUNTARY STANDARDS FOR HEALTH FACILITIES [OSHPD 1, 2 & 4]

  4. Store astronomical time parameters (used to develop longitude, latitude, time zone) for at least 7 days if power is interrupted; and
  5. Display date/time, sunrise and sunset and switching times for each step; and
  6. Have an automatic daylight savings time adjustment; and
  7. Have automatic time switch capabilities specified in Section A6.209.1.3.

  A6.209.1.9 Outdoor astronomical time-switch controls. Outdoor astronomical time-switch controls used to control outdoor lighting as specified in Section A6.209.3.3 shall:

  1. Contain at least two separately programmable steps per function area; and

  2. Have the ability to independently offset the on and off times for each channel by 0 to 99 minutes before or after sunrise or sunset; and

  3. Have sunrise and sunset prediction accuracy within +/- 15 minutes and timekeeping accuracy within 5 minutes per year; and

  4. Store astronomical time parameters (used to develop longitude, latitude, time zone) for at least 7 days if power is interrupted; and

  5. Display date/time, sunrise and sunset; and

  6. Have an automatic daylight savings time adjustment; and

  7. Have automatic time switch capabilities specified in Section A6.209.1.3.