Laundry Equipment & Clothes Dryers

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

• CMC § 907.0 Medium relevance — show source text

  TABLE OF CONTENTS

  907.0 Wall Furnaces. . . . . . . . . . . . . . . . 204

  907.1 Application . . . . . . . . . . . . . . . . . . 204

  907.2 Installation . . . . . . . . . . . . . . . . . . 204

  907.3 Location . . . . . . . . . . . . . . . . . . . . 205

  907.4 Combustion and Circulating Air . . 205

  907.5 Oil-Fired Wall Furnaces . . . . . . . . 205

  908.0 Clothes Dryers . . . . . . . . . . . . . . . 205

  908.1 Application . . . . . . . . . . . . . . . . . . 205

  908.2 Electric Clothes Dryers . . . . . . . . . 205

  908.3 Gas-Fired Clothes Dryers. . . . . . . 205

  909.0 Conversion Burners . . . . . . . . . . . 205

  909.1 General. . . . . . . . . . . . . . . . . . . . . 205

  910.0 Burner Assemblies . . . . . . . . . . . . 206

  910.1 Oil Burners . . . . . . . . . . . . . . . . . . 206

  910.2 Gas Burners . . . . . . . . . . . . . . . . . 206

  911.0 Decorative Appliances for Installation in Vented Fireplaces. . . 206

  911.1 Application . . . . . . . . . . . . . . . . . . 206

  911.2 Prohibited Installations . . . . . . . . . 206

  911.3 Installation . . . . . . . . . . . . . . . . . . 206

  911.4 Fireplace Screens. . . . . . . . . . . . . 206

  912.0 Gas Fireplaces, Vented . . . . . . . . 206

  912.1 Application . . . . . . . . . . . . . . . . . . 206

  912.2 Reserved . . . . . . . . . . . . . . . . . . . 206

  912.3 Installation . . . . . . . . . . . . . . . . . . 206

  912.4 Combustion and Circulating Air . . . 206

  913.0 Factory-Built Fireplaces and Fireplace Stoves. . . . . . . . . . . . . . 206

  913.1 Factory-Built Fireplaces . . . . . . . . 206

  913.2 Fireplace Stoves. . . . . . . . . . . . . . 206

  913.3 Fireplace Accessories . . . . . . . . . 206

  914.0 Non-Recirculating Direct Gas-Fired Industrial Air Heaters. . . 206

  914.1 Application . . . . . . . . . . . . . . . . . . 206

  914.2 Prohibited Installations . . . . . . . . . 206

  914.3 Installation . . . . . . . . . . . . . . . . . . 206

  914.4 Clearance from Combustible

  Materials . . . . . . . . . . . . . . . . . . . . 207

• CMC § 905.8 Medium relevance — show source text

  905.8 Installation in Commercial

  Garages and Aircraft Hangars . . . 203

  905.9 Electric Duct Heaters . . . . . . . . . . 203

  906.0 Floor Furnaces . . . . . . . . . . . . . . . 203

  906.1 Application . . . . . . . . . . . . . . . . . . 203

  906.2 Installation . . . . . . . . . . . . . . . . . . 204

  906.3 Temperature Limit Controls . . . . . 204

  906.4 Combustion and Circulating Air. . . 204

  906.5 Placement. . . . . . . . . . . . . . . . . . . 204

  906.6 Bracing . . . . . . . . . . . . . . . . . . . . . 204

  906.7 Support . . . . . . . . . . . . . . . . . . . . . 204

  906.8 Clearance . . . . . . . . . . . . . . . . . . . 204

  906.9 Access . . . . . . . . . . . . . . . . . . . . . 204

  906.10 Seepage Pan . . . . . . . . . . . . . . . . 204

  906.11 Wind Protection . . . . . . . . . . . . . . 204

  906.12 Upper Floor Installations. . . . . . . . 204

  906.13 First Floor Installation . . . . . . . . . . 204

  906.14 Oil-Fired Floor Furnaces. . . . . . . . 204

  xxxv

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  TABLE OF CONTENTS

  907.0 Wall Furnaces. . . . . . . . . . . . . . . . 204

  907.1 Application . . . . . . . . . . . . . . . . . . 204

  907.2 Installation . . . . . . . . . . . . . . . . . . 204

  907.3 Location . . . . . . . . . . . . . . . . . . . . 205

  907.4 Combustion and Circulating Air . . 205

  907.5 Oil-Fired Wall Furnaces . . . . . . . . 205

  908.0 Clothes Dryers . . . . . . . . . . . . . . . 205

  908.1 Application . . . . . . . . . . . . . . . . . . 205

  908.2 Electric Clothes Dryers . . . . . . . . . 205

  908.3 Gas-Fired Clothes Dryers. . . . . . . 205

  909.0 Conversion Burners . . . . . . . . . . . 205

  909.1 General. . . . . . . . . . . . . . . . . . . . . 205

  910.0 Burner Assemblies . . . . . . . . . . . . 206

  910.1 Oil Burners . . . . . . . . . . . . . . . . . . 206

  910.2 Gas Burners . . . . . . . . . . . . . . . . . 206

  911.0 Decorative Appliances for Installation in Vented Fireplaces. . . 206

• CMC § 1127A.10.4 Medium relevance — show source text

  1127A.10.4 Washing machines and clothes dryers. Washing machines and clothes dryers in accessible common use laundry rooms shall be front loading.

  The bottom of the opening to the laundry compartment shall be located 15 inches (381 mm) minimum and 36 inches (914 mm) maximum above the finish floor.

  1127A.11 Storage.

  1127A.11.1 General. If fixed storage facilities such as cabinets, shelves, closets or drawers are provided where access is required by Sections 1.8.2.1.2 and 1102A, at least one of each type of facility provided shall comply with this section. Additional storage may be provided outside of the reach ranges specified in Section 1138A.3.

  1127A.11.2 Clear floor space. A clear floor space at least 30 inches by 48 inches (762 mm by 1219 mm) complying with Section 1138A.1.4 that allows either a forward or parallel approach by a person using a wheelchair shall be provided at accessible storage facilities.

  1127A.11.3 Height. Accessible storage spaces and clothes rods shall be within at least one of the reach ranges specified in Section 1138A.3. (See Figure 11A-1J and Figure 11A-1I.)

  1127A.11.4 Hardware. Hardware for accessible storage facilities shall comply with Section 1138A.4. Touch latches and U-shaped pulls are acceptable.

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  HOUSING ACCESSIBILITY

  1127A.12 Fixed or built-in seating, tables and counters.

  1127A.12.1 Minimum seating. Where fixed or built-in seating, tables or counters are provided for residents or guests, 5 percent, but not less than one, shall be accessible as provided in this section.

  1127A.12.2 Clear floor space. When seating spaces for persons in wheelchairs are provided at fixed tables or counters, clear floor space complying with Section 1138A.1.4 positioned for a forward approach shall be provided. Such clear floor space shall not overlap the required knee and toe space by more than 19 inches (483 mm). (See Figure 11A-1K.)

  1127A.12.3 Knee and toe space. When seating for persons in wheelchairs is provided at fixed tables or counters, knee and toe space complying with Section 1138A.2 shall be provided. (See Figure 11A-1K.)

  1127A.12.4 Height of work surfaces. The tops of tables and counters shall be 28 inches to 34 inches (711 mm to 864 mm) from the finish floor.

  Exception: When food or drink is served for consumption at a counter exceeding 34 inches (864 mm) in height, only a portion of the main counter, 60 inches (1524 mm) minimum in length, shall be provided in compliance with this section.

  1127A.13 Electric vehicle charging stations. (Reserved)

  11A-30 2025 CALIFORNIA BUILDING CODE

• CMC § 504.4 Medium relevance — show source text

  (6) Range hoods shall discharge to the outdoors through a single wall duct and shall not terminate in an attic or crawl space.

  504.4 Clothes Dryers. A clothes dryer exhaust duct shall not be connected to a vent connector, gas vent, chimney, and shall not terminate into a crawl space, attic, or other concealed space. Exhaust ducts shall not be assembled with screws or other fastening means that extend into the duct and that are capable of catching lint, and that reduce the efficiency of the exhaust system. Exhaust ducts shall be constructed of rigid metallic material. Transition ducts used to connect the dryer to the exhaust duct shall be listed and labeled in accordance

  with UL 2158A, or installed in accordance with the clothes dryer manufacturer’s installation instructions. Clothes dryer exhaust ducts shall terminate to the outside of the building in accordance with Section 502.2.1 and shall be equipped with a backdraft damper. Screens shall not be installed at the duct termination. Devices, such as fire or smoke dampers that will obstruct the flow of the exhaust shall not be used. Where joining of ducts, the male end shall be inserted in the direction of airflow.

  504.4.1 Provisions for Makeup Air. Makeup air shall be provided in accordance with the following:

  (1) Makeup air shall be provided for Type 1 clothes dryers in accordance with the manufacturer’s installa tion instructions. [NFPA 54:10.4.4.1] Where a closet is designed for the installation of a clothes dryer, an opening of not less than 100 square inches (0.065 m [2] ) for makeup air shall be provided in the door or by other approved means.

  (2) Provision for makeup air shall be provided for Type 2 clothes dryers, with a minimum free area of 1 square inch (0.0006 m [2] ) for each 1000 British thermal units per hour (Btu/h) (0.293 kW) total input rating of the dryer(s) installed. [NFPA 54:10.4.4.2]

  504.4.2 Domestic Clothes Dryers. Where a compartment or space for a Type 1 clothes dryer is provided, not less than a 4 inch diameter (102 mm) exhaust duct of approved material shall be installed in accordance with Section 504.0.

  Type 1 clothes dryer exhaust ducts shall be of rigid metal and shall have smooth interior surfaces. The diam eter shall be not less than 4 inches nominal (100 mm), and the thickness shall be not less than 0.016 of an inch

  (0.406 mm).

  504.4.2.1 Length Limitation. Unless otherwise permitted or required by the dryer manufacturer’s instructions and approved by the Authority Having Jurisdiction, domestic dryer moisture exhaust ducts

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  EXHAUST SYSTEMS

  shall not exceed a total combined horizontal and ver tical length of 14 feet (4267 mm), including two 90 degree (1.57 rad) elbows. A length of 2 feet (610 mm) shall be deducted for each 90 degree (1.57 rad) elbow in excess of two.

• CMC § 10.4.6.3 Medium relevance — show source text

  (3) Type 2 clothes dryers shall be equipped or installed with lint-controlling means. [NFPA 54:10.4.6.3]

  (4) Where ducts pass through walls, floors, or partitions, the space around the duct shall be sealed with noncombustible material. [NFPA 54:10.4.6.4]

  (5) Multiple installations of Type 2 clothes dryers shall be made in a manner to prevent adverse operation due to back pressures that might be created in the exhaust systems. [NFPA 54:10.4.6.5] The exhaust fan shall operate con

  tinuously or shall be interlocked to exhaust air where a clothes dryer is in operation.

  504.4.4 Common Exhaust. Where permitted by the clothes dryer manufacturer’s installation instructions, multiple clothes dryers shall be permitted to be installed with a common exhaust. The common exhaust duct shall

  be constructed of rigid metal and shall be installed in a fire-resistant rated enclosure in accordance with the

  building code. The duct material shall be of rigid metal with a thickness of not less than 0.020 of an inch (0.508 mm) (24 gauge). The duct enclosure shall be provided with a cleanout opening at the base of not less than 12 inches by 12 inches (305 mm by 305 mm). The exhaust fan shall be located downstream of branch connections

  and operated continuously and shall be monitored by an approved means.

  504.4.5 Duct Supports. Ducts shall be supported at intervals not to exceed 4 feet (1219 mm) and in accordance with SMACNA HVAC Duct Construction Stan dards – Metal and Flexible.

  504.4.6 Multistory Exhausting of Dryers. Each vertical riser shall be provided with a means for cleanout or access door located at the bottom of the main exhaust

  shaft for lint removal.

  504.5 Heat Recovery Ventilation (HRV) and Energy Recovery Ventilation (ERV) Systems. Heat recovery ventilators (HRV) and energy recovery ventilators (ERV) shall be installed in accordance with their listings and comply with the appliance manufacturer’s installation instructions. Non-ducted heat recovery ventilators shall comply with UL 1815. Ducted heat recovery ventilators shall comply with UL 1812. Heat recovery ventilator and energy recovery ventilator ducts shall comply with Chapter 6.

  505.0 Product-Conveying Systems.

  505.1 General. A mechanical ventilation or exhaust system shall be installed to control, capture, and remove emissions generated from product use or handling where required in accordance with the building code or fire code and where such emissions result in a hazard to life or property. The design of the system shall be such that the emissions are confined to the area in which they are generated by air currents, hoods, or enclosures and shall be exhausted by a duct system to a safe location or treated by removing contaminants. Ducts conveying explosives or flammable vapors, fumes, or dusts shall extend directly to the exterior of the building without entering other spaces and shall not extend into or through ducts and plenums.

  Exception: Ducts conveying vapor or fumes having flammable constituents less than 25 percent of their Lower Flammability Limit (LFL) shall be permitted to pass through other

  spaces.

  505.1.1 Mechanical Ventilation. A mechanical ven tilation system shall be interlocked to operate with the

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• CMC § 10.10.13 Medium relevance — show source text

  [NFPA 54:10.10.13]

  906.14 Oil-Fired Floor Furnaces. Oil-fired floor furnaces shall comply with UL 729 and installed in accordance with the manufacturer’s installation instructions.

  907.0 Wall Furnaces.

  907.1 Application. Wall furnaces shall be listed in accordance with ANSI Z21.86/CSA 2.32. [NFPA 54:10.25.1]

  907.2 Installation. Wall furnaces shall be installed in accor dance with the manufacturer’s installation instructions. Wall

  furnaces installed in or attached to combustible material shall be listed for such installation. [NFPA 54:10.25.2.1]

  907.2.1 Vented Wall Furnaces. Vented wall furnaces connected to a Type B-W gas vent system listed only for a single story shall be installed only in single-story buildings or the top story of multistory buildings. Vented wall furnaces connected to a Type B-W gas vent system listed for installation in multistory buildings shall be permitted to be installed in single-story or multistory buildings. Type B-W gas vents shall be attached directly to a solid header plate that serves as a firestop at that point and that

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  INSTALLATION OF SPECIFIC APPLIANCES

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  907.4 Combustion and Circulating Air. Combustion and circulating air shall be provided in accordance with Section 701.0. [NFPA 54:10.25.4]

  907.5 Oil-Fired Wall Furnaces. Oil-fired wall furnaces

  shall comply with UL 730 and installed in accordance with the manufacturer’s installation instructions.

  908.0 Clothes Dryers.

  908.1 Application. Clothes dryers shall be listed in accordance with ANSI Z21.5.1/CSA 7.1 for Type I clothes dryers or ANSI Z21.5.2/CSA 7.2 for Type II clothes dryers. [NFPA 54:10.4.1]

  908.2 Electric Clothes Dryers. Commercial electric clothes dryers shall comply with UL 1240 and installed in accordance with the manufacturer’s installation instructions.

  Residential and coin-operated electric clothes dryers shall comply with UL 2158 and installed in accordance with the manufacturer’s installation instructions.

  908.3 Gas-Fired Clothes Dryers. Gas-fired clothes dryers shall comply with Section 908.3.1 through Section 908.3.3.

  908.3.1 Clearance. The installation of clothes dryers shall comply with the following requirements:

  (1) Listed Type 1 clothes dryers shall be installed with a clearance of not less than 6 inches (152 mm) from adjacent combustible material. Clothes dryers listed for installation at reduced clearances shall be

  installed in accordance with their listing and the manufacturer’s installation instructions. Type 1 clothes dryers installed in closets shall be listed for such installation.

• CMC § 0.0006 Medium relevance — show source text

  (2) Provision for makeup air shall be provided for Type 2 clothes dryers, with a minimum free area of 1 square inch (0.0006 m [2] ) for each 1000 British thermal units per hour (Btu/h) (0.293 kW) total input rating of the dryer(s) installed. [NFPA 54:10.4.4.2]

  504.4.2 Domestic Clothes Dryers. Where a compartment or space for a Type 1 clothes dryer is provided, not less than a 4 inch diameter (102 mm) exhaust duct of approved material shall be installed in accordance with Section 504.0.

  Type 1 clothes dryer exhaust ducts shall be of rigid metal and shall have smooth interior surfaces. The diam eter shall be not less than 4 inches nominal (100 mm), and the thickness shall be not less than 0.016 of an inch

  (0.406 mm).

  504.4.2.1 Length Limitation. Unless otherwise permitted or required by the dryer manufacturer’s instructions and approved by the Authority Having Jurisdiction, domestic dryer moisture exhaust ducts

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  EXHAUST SYSTEMS

  shall not exceed a total combined horizontal and ver tical length of 14 feet (4267 mm), including two 90 degree (1.57 rad) elbows. A length of 2 feet (610 mm) shall be deducted for each 90 degree (1.57 rad) elbow in excess of two.

  Exception: Where an exhaust duct power ventilator, in accordance with Section 504.4.2.3, is used, the maximum length of the dryer exhaust duct shall be permitted to be in accordance with the dryer exhaust duct power ventilator manufacturer’s installation instructions.

  504.4.2.2 Transition Ducts. Listed clothes dryer transition ducts not more than 6 feet (1829 mm) in length shall be permitted to be used to connect the Type 1 dryer to the exhaust ducts. Transition ducts and flexible clothes dryer transition ducts shall not be concealed within construction, and shall be installed in accordance with the manufacturer’s

  installation instructions.

  504.4.2.3 Exhaust Duct Power Ventilators.

  Dryer exhaust duct power ventilators for single residential clothes dryers shall be listed and labeled in accordance with UL 705 and installed in accor dance with the manufacturer’s installation instruc tions.

  504.4.3 Commercial Clothes Dryers. Commercial dryer exhaust ducts shall be installed in accordance with their listings. The installation of commercial clothes dryer exhaust ducts shall comply with the appliance manufacturer’s installation instructions.

  504.4.3.1 Exhaust Ducts for Type 2 Clothes Dryers. Exhaust ducts for Type 2 clothes dryers shall comply with the following:

  (1) Exhaust ducts for Type 2 clothes dryers shall comply with Section 504.4. [NFPA 54:10.4.6.1]

• CMC § 608.18 Medium relevance — show source text

  [M] 608.18 Group A2L and B2L refrigerant. Machinery rooms for Group A2L and B2L refrigerant shall comply with Sections 1106.4.1 through 1106.4.3 of the California Mechanical Code .

  608.18.1 Elevated temperatures. Open flame-producing devices or continuously operating hot surfaces over 1,290°F (700°C) shall not be permanently installed in the room.

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  BUILDING SERVICES AND SYSTEMS

  [M] 608.18.2 Refrigerant detector. In addition to the requirements of Section 1105.3 of the California Mechanical Code, refrigerant detectors shall signal an alarm and activate the ventilation system in accordance with the response time specified in Table 608.18.2.

  TABLE 608.18.2—GROUP A2L AND B2L DETECTOR ACTIVATION	Col2	Col3	Col4	Col5
  ACTIVATION LEVEL	MAXIMUM RESPONSE TIME (seconds)	ASHRAE 15 VENTILATION LEVEL	ALARM RESET	ALARM TYPE
  Less than or equal to the OEL in Table 1103.1 of the California Mechanical Code	300	1	Automatic	Trouble
  Less than or equal to the refrigerant concentration level in Table 1103.1 of the_California Mechanical Code_	15	2	Manual	Emergency

  [M] 608.18.3 Mechanical ventilation. The machinery room shall have a mechanical ventilation system complying with ASHRAE 15.

  SECTION 609—HYPERBARIC FACILITIES

  609.1 General. Hyperbaric facilities shall be inspected, tested and maintained in accordance with NFPA 99.

  609.2 Records. Records shall be maintained of all testing and repair conducted on the hyperbaric chamber and associated devices and equipment. Records shall be available to the fire code official.

  SECTION 610—CLOTHES DRYER EXHAUST SYSTEMS

  610.1 Clothes dryer exhaust duct systems. Clothes dryer exhaust duct systems shall be in accordance with Sections 610.1.1 and 610.1.2.

  610.1.1 Installation. Clothes dryer exhaust duct systems shall be installed in accordance with the California Mechanical Code or the International Fuel Gas Code, and the manufacturer’s installation instructions.

  610.1.2 Maintenance. The lint trap, mechanical and heating components, and the exhaust duct system of a clothes dryer shall be maintained in accordance with the manufacturer’s operating instructions to prevent the accumulation of lint or debris that prevents the exhaust of air and products of combustion.

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  6-14 2025 CALIFORNIA FIRE CODE

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  CALIFORNIA FIRE CODE – MATRIX ADOPTION TABLE

  CHAPTER 7 – FIRE AND SMOKE PROTECTION FEATURES

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

• CMC § 907.4 Medium relevance — show source text

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  907.4 Combustion and Circulating Air. Combustion and circulating air shall be provided in accordance with Section 701.0. [NFPA 54:10.25.4]

  907.5 Oil-Fired Wall Furnaces. Oil-fired wall furnaces

  shall comply with UL 730 and installed in accordance with the manufacturer’s installation instructions.

  908.0 Clothes Dryers.

  908.1 Application. Clothes dryers shall be listed in accordance with ANSI Z21.5.1/CSA 7.1 for Type I clothes dryers or ANSI Z21.5.2/CSA 7.2 for Type II clothes dryers. [NFPA 54:10.4.1]

  908.2 Electric Clothes Dryers. Commercial electric clothes dryers shall comply with UL 1240 and installed in accordance with the manufacturer’s installation instructions.

  Residential and coin-operated electric clothes dryers shall comply with UL 2158 and installed in accordance with the manufacturer’s installation instructions.

  908.3 Gas-Fired Clothes Dryers. Gas-fired clothes dryers shall comply with Section 908.3.1 through Section 908.3.3.

  908.3.1 Clearance. The installation of clothes dryers shall comply with the following requirements:

  (1) Listed Type 1 clothes dryers shall be installed with a clearance of not less than 6 inches (152 mm) from adjacent combustible material. Clothes dryers listed for installation at reduced clearances shall be

  installed in accordance with their listing and the manufacturer’s installation instructions. Type 1 clothes dryers installed in closets shall be listed for such installation.

  (2) Listed Type 2 clothes dryers shall be installed with clearances of not less than those shown on the mark ing plate and in the manufacturer’s instructions. Type 2 clothes dryers designed and marked, “For use only in noncombustible locations,” shall not be installed elsewhere.

  (3) Unlisted clothes dryers shall be installed with clearances to combustible material of not less than 18

  inches (457 mm). Combustible floors under unlisted clothes dryers shall be protected in an approved manner. {NFPA 54:10.4.2}

  908.3.2 Exhausting to the Outdoors. Type 1 and Type 2 clothes dryers shall be exhausted to the outside air in accordance with Section 504.4. {NFPA 54:10.4.3}

  908.3.3 Multiple-Family or Public Use. All clothes dryers installed for multiple-family or public use shall be installed as specified for a Type 2 clothes dryer under Section 504.4.3.1. [NFPA 54:10.4.7]

  909.0 Conversion Burners.

  909.1 General. Installation of conversion burners shall con form to CSA Z21.8. [NFPA 54:10.5]

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  shall be permitted to be an integral part of the vented wall furnace, as illustrated in Figure 907.2.1. The stud space in which the vented wall furnace is installed shall be ventilated at the first ceiling level by installation of the ceiling plate spacers furnished with the gas vent. Firestop spacers shall be installed at each subsequent ceiling or floor level penetrated by the vent. [NFPA 54:10.25.2.2]

• CMC § 510.9. Medium relevance — show source text

  Exception: Type I Hood exhaust termination shall be in accordance with Section 510.9.

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  EXHAUST SYSTEMS

  tem in accordance with Section 505.7.3 do not require design as Class 1 product-conveying ducts.

  Exceptions:

  (1) Ductless range hoods where installed in accordance with the manufacturer’s installation instructions.

  (2) Condensing clothes dryers where installed in accordance with the manufacturer’s installation instructions.

  504.1.1 Backdraft Protection. Exhaust ducts shall terminate outside the building and shall be equipped with backdraft dampers or with motorized dampers that automatically shut where the systems or spaces served are not in use. [OSHPD 1, 1R, 2, 4 & 5] Exception: Back- draft dampers are not required when the exhaust fan must operate continuously.

  Exception: Where the exhaust duct does not discharge into a common exhaust plenum and one of the following:

  (1) The exhaust fan runs continuously.

  (2) The exhaust duct serves space(s) that are not mechanically heated or cooled.

  (3) The space served is maintained at positive pressure. 504.2 Independent Exhaust Systems. Single or combined mechanical exhaust systems for environmental air shall be independent of other exhaust systems. Combined exhaust systems shall operate at negative pressure and shall terminate in accordance with Section 502.2.1. Clothes dryer exhaust systems shall be independent of all other exhaust systems except where permitted in Section 504.4.4. 504.3 Domestic Cooking Exhaust Equipment. Domestic cooking exhaust equipment shall comply with the following requirements, as applicable:

  (1) The fan for overhead range hoods and downdraft exhaust equipment not integral with the cooking appliance shall comply with UL 507.

  (2) Overhead range hoods and downdraft exhaust equipment with integral fans shall comply with UL 507.

  (3) Domestic cooking appliances with integral downdraft exhaust equipment shall comply with UL 858 or CSA/ANSI Z21.1/CSA 1.1.

  (4) Microwave ovens with integral exhaust for installation over the cooking surface shall comply with UL 923.

  (5) All domestic kitchen exhaust ducts used in conjunction with domestic range or cooktop hoods shall be constructed of metal and shall have smooth interior surfaces, fastened and sealed with duct mastic or metal tapes that meet the requirements of UL 181A.

  Exception: Ducts for domestic kitchen downdraft grillrange ventilation installed under a concrete slab floor shall be permitted to be of approved Schedule 40 PVC provided the following conditions are met:

  (1) The under-floor trench in which the duct is installed shall be completely backfilled with sand or gravel.

  (2) Not more than 1 inch (25.4 mm) of 6 inch diameter (150 mm) PVC coupling shall be permitted to protrude above the concrete floor surface.

  (3) PVC pipe joints shall be solvent cemented to provide an air and greasetight duct.

  (4) The duct shall terminate above grade outside the building and shall be equipped with a backdraft damper.

  (6) Range hoods shall discharge to the outdoors through a single wall duct and shall not terminate in an attic or crawl space.

• CMC § 609.1 Medium relevance — show source text

  SECTION 609—HYPERBARIC FACILITIES

  609.1 General. Hyperbaric facilities shall be inspected, tested and maintained in accordance with NFPA 99.

  609.2 Records. Records shall be maintained of all testing and repair conducted on the hyperbaric chamber and associated devices and equipment. Records shall be available to the fire code official.

  SECTION 610—CLOTHES DRYER EXHAUST SYSTEMS

  610.1 Clothes dryer exhaust duct systems. Clothes dryer exhaust duct systems shall be in accordance with Sections 610.1.1 and 610.1.2.

  610.1.1 Installation. Clothes dryer exhaust duct systems shall be installed in accordance with the California Mechanical Code or the International Fuel Gas Code, and the manufacturer’s installation instructions.

  610.1.2 Maintenance. The lint trap, mechanical and heating components, and the exhaust duct system of a clothes dryer shall be maintained in accordance with the manufacturer’s operating instructions to prevent the accumulation of lint or debris that prevents the exhaust of air and products of combustion.

  2025 CALIFORNIA FIRE CODE 6-13

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

  6-14 2025 CALIFORNIA FIRE CODE

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

  CALIFORNIA FIRE CODE – MATRIX ADOPTION TABLE

  CHAPTER 7 – FIRE AND SMOKE PROTECTION FEATURES

  (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	Col5	HCD	Col7	Col8	DSA	Col10	OSHPD	Col12	Col13	Col14	Col15	Col16	BSCC	DPH	AGR	DWR	CEC	CA	SL	SLC
  Adopting Agency	BSC	BSC- CG	T-24	T-19*	1	2	1/AC	AC	SS	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
  [California Code of Regulations, Title 19, Division 1]
  Chapter / Section
  709			X

• CMC § 1.1. Medium relevance — show source text

  (1) The fan for overhead range hoods and downdraft exhaust equipment not integral with the cooking appliance shall comply with UL 507.

  (2) Overhead range hoods and downdraft exhaust equipment with integral fans shall comply with UL 507.

  (3) Domestic cooking appliances with integral downdraft exhaust equipment shall comply with UL 858 or CSA/ANSI Z21.1/CSA 1.1.

  (4) Microwave ovens with integral exhaust for installation over the cooking surface shall comply with UL 923.

  (5) All domestic kitchen exhaust ducts used in conjunction with domestic range or cooktop hoods shall be constructed of metal and shall have smooth interior surfaces, fastened and sealed with duct mastic or metal tapes that meet the requirements of UL 181A.

  Exception: Ducts for domestic kitchen downdraft grillrange ventilation installed under a concrete slab floor shall be permitted to be of approved Schedule 40 PVC provided the following conditions are met:

  (1) The under-floor trench in which the duct is installed shall be completely backfilled with sand or gravel.

  (2) Not more than 1 inch (25.4 mm) of 6 inch diameter (150 mm) PVC coupling shall be permitted to protrude above the concrete floor surface.

  (3) PVC pipe joints shall be solvent cemented to provide an air and greasetight duct.

  (4) The duct shall terminate above grade outside the building and shall be equipped with a backdraft damper.

  (6) Range hoods shall discharge to the outdoors through a single wall duct and shall not terminate in an attic or crawl space.

  504.4 Clothes Dryers. A clothes dryer exhaust duct shall not be connected to a vent connector, gas vent, chimney, and shall not terminate into a crawl space, attic, or other concealed space. Exhaust ducts shall not be assembled with screws or other fastening means that extend into the duct and that are capable of catching lint, and that reduce the efficiency of the exhaust system. Exhaust ducts shall be constructed of rigid metallic material. Transition ducts used to connect the dryer to the exhaust duct shall be listed and labeled in accordance

  with UL 2158A, or installed in accordance with the clothes dryer manufacturer’s installation instructions. Clothes dryer exhaust ducts shall terminate to the outside of the building in accordance with Section 502.2.1 and shall be equipped with a backdraft damper. Screens shall not be installed at the duct termination. Devices, such as fire or smoke dampers that will obstruct the flow of the exhaust shall not be used. Where joining of ducts, the male end shall be inserted in the direction of airflow.

  504.4.1 Provisions for Makeup Air. Makeup air shall be provided in accordance with the following:

  (1) Makeup air shall be provided for Type 1 clothes dryers in accordance with the manufacturer’s installa tion instructions. [NFPA 54:10.4.4.1] Where a closet is designed for the installation of a clothes dryer, an opening of not less than 100 square inches (0.065 m [2] ) for makeup air shall be provided in the door or by other approved means.