Section L104 — DESIGN AND INSTALLATION — 2025 California Fire Code (Title 24, Part 9)

L104.1 Design and installation. ¶

L104.1 Design and installation. A FARS shall be designed and installed in accordance with Sections L104.2 through L104.15.3.

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L104.2 Standards. ¶

L104.2 Standards. Firefighter air replenishment systems shall be in accordance with Sections L104.2.1 and L104.2.2. L104.2.1 Pressurized system components. Pressurized system components shall be designed and installed in accordance with ASME B31.3. L104.2.2 Air quality. The system shall be designed to convey breathing air complying with NFPA 1989.

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L104.3 Design and operating pressure. ¶

L104.3 Design and operating pressure. The minimum design pressure shall be 110 percent of the fire department’s normal SCBA fill pressure. The system design pressure shall be marked in an approved manner at the supply connections, and adjacent to pressure gauges on any fixed air supply components. Pressure shall be maintained in the system within 5 percent of the design pressure.

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L104.4 Cylinder refill rate. ¶

L104.4 Cylinder refill rate. The FARS shall be capable of refilling breathing air cylinders of a size and pressure used by the fire department at a rate of not less than two empty cylinders in 2 minutes. on Jul 18, 2025 11:14 AM (CDT) THEREUNDER. APPENDIX L—REQUIREMENTS FOR FIREFIGHTER AIR REPLENISHMENT SYSTEMS

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted

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L104.5 Breathing air supply. ¶

L104.5 Breathing air supply. Where a fire department mobile air unit is available, the FARS shall be supplied by an external mobile air connection in accordance with Section L104.14. Where a fire department mobile air unit is not available, a stored pressure air supply shall be provided in accordance with Section L104.5.1. A stored pressure air supply shall be permitted to be added to a system supplied by an external mobile air connection provided that a means to bypass the stored pressure air supply is located at the external mobile air connection. L104.5.1 Stored pressure air supply. A…

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use

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L104.6 Isolation valves. ¶

L104.6 Isolation valves. System isolation valves that allow access for the fire department shall be installed on the system riser to allow piping beyond any air cylinder refill panel to be blocked.

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L104.7 Pressure relief valve. ¶

L104.7 Pressure relief valve. Pressure relief valves shall be installed at each point of supply and at the top or end of every riser. The relief valve shall meet the requirements of CGA S-1.3 and shall not be field adjustable. Pressure relief valves shall discharge in a manner that does not endanger personnel who are in the area. Valves, plugs or caps shall not be installed in the discharge of a pressure relief valve. Where discharge piping is used the end shall not be threaded.

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard

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L104.8 Materials and equipment. ¶

L104.8 Materials and equipment. Pressurized system components shall be listed or approved for their intended use and rated for the maximum allowable design pressure in the system. Piping and fittings shall be stainless steel.

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L104.9 Welded connections. Piping connections that are concealed shall be welded. ¶

L104.9 Welded connections. Piping connections that are concealed shall be welded.

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L104.10 Protection of piping. ¶

L104.10 Protection of piping. System piping shall be protected from physical damage in an approved manner.

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L104.11 Compatibility. ¶

L104.11 Compatibility. Fittings and connections intended to be used by the fire department shall be compatible with the fire department’s equipment.

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L104.12 Security. ¶

L104.12 Security. Connections to a FARS shall be safeguarded from unauthorized access in an approved manner.

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L104.13 Fill stations. ¶

L104.13 Fill stations. Firefighter air replenishment fill stations shall comply with Section L104.13.1 through L104.13.3. L104.13.1 Location. Fill stations for refilling breathing air cylinders shall be located as follows: 1. Fill stations shall be provided at the fifth floor above and below the ground level floor and every third floor level thereafter. 2. On floor levels requiring fill stations, one fill station shall be provided adjacent to a required exit stair at a location designated by the fire code official. In buildings required to have three or more exit stairs, additional fill…

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use

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L104.14 External mobile air connection. ¶

L104.14 External mobile air connection. An external mobile air connection shall be provided for fire department mobile air apparatus where required by Section L104.5 to supply the system with breathing air. L104.14.1 Location. The location of the external mobile air connection shall have access for mobile air apparatus and approved by the fire code official. L104.14.2 Protection from vehicles. A means of vehicle impact protection in accordance with Section 312 shall be provided to protect mobile air connections that are subject to vehicular impact. L104.14.3 Clear space around connections. A…

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use

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L104.15 Air monitoring system. ¶

L104.15 Air monitoring system. An approved air monitoring system shall be provided. The system shall automatically monitor air quality, moisture and pressure on a continual basis. The air monitoring system shall be equipped with not less than two content analyzers capable of detecting carbon monoxide, carbon dioxide, nitrogen, oxygen, moisture and hydrocarbons. L104.15.1 Alarm conditions. The air monitoring system shall transmit a supervisory signal when any of the following levels are detected: 1. Carbon monoxide exceeds 5 ppm. 2. Carbon dioxide exceeds 1,000 ppm. 3. An oxygen level below…

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use

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