Chapter 24 — FLAMMABLE FINISHES
Section 2404 — SPRAY FINISHING
2025 California Fire Code (Title 24, Part 9) · 2025 edition · ingested 2026-07-07 · California
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2404.1 General. ¶
2404.1 General. The application of flammable or combustible liquids by means of spray apparatus in continuous or intermittent processes shall be in accordance with the requirements of Sections 2403 and 2404.4 through 2404.11.4.
2404.2 Prohibited enclosures for spray application operations. ¶
2404.2 Prohibited enclosures for spray application operations. Inflatable or portable enclosures shall not be used for spray application of flammable finishes. Exception: Enclosures for the spray application of flammable finishes in marinas, dry docking areas or construction areas shall comply with Section 2404.3.
2404.3 Membrane enclosures. ¶
2404.3 Membrane enclosures. The design, construction, protection, operation and maintenance of membrane enclosures shall be in accordance with NFPA 33.
2404.4 Location of spray-finishing operations. ¶
2404.4 Location of spray-finishing operations. Spray-finishing operations conducted in buildings used for Group A, E, I or R occupancies shall be located in a spray room protected with an approved automatic sprinkler system installed in accordance with Section 903.3.1.1 and separated vertically and horizontally from the remainder of the building by fire barrier walls and horizontal assemblies with not less than a 1-hour fire-resistance rating in accordance with the California Building Code . In other occupancies, spray-finishing operations shall be conducted in a spray room, spray booth or…
2404.5 Design and construction. ¶
2404.5 Design and construction. Design and construction of spray rooms, spray booths and spray spaces shall be in accordance with Sections 2404.5.1 through 2404.5.5.1. 2404.5.1 Spray rooms. Spray rooms shall be constructed and designed in accordance with Section 416 of the California Building Code and Section 2404.5.2 of this code, and shall comply with Sections 2404.6 through 2404.10 of this code. 2404.5.2 Floor. Combustible floor construction in spray rooms shall be covered by approved, noncombustible, nonsparking material, except where combustible coverings, including but not limited to…
2404.6 Fire protection. ¶
2404.6 Fire protection. Spray booths and spray rooms shall be protected by an approved automatic fire-extinguishing system complying with Chapter 9. Protection shall extend to exhaust plenums, exhaust ducts and both sides of dry filters where such filters are used. 2404.6.1 Fire extinguishers. Portable fire extinguishers complying with Section 906 shall be provided for spraying areas in accordance with the requirements for an extra (high) hazard occupancy.
2404.7 Housekeeping, maintenance and storage of hazardous materials. ¶
2404.7 Housekeeping, maintenance and storage of hazardous materials. Housekeeping, maintenance, storage and use of hazardous materials shall be in accordance with Sections 2403.3, 2403.4, 2404.7.1 and 2404.7.2. 2404.7.1 Different coatings. Spray booths, spray rooms and spraying spaces shall not be alternately utilized for different types of coating materials where the combination of materials is conducive to spontaneous ignition, unless all deposits of one material are removed from the booth, room or space and exhaust ducts prior to spraying with a different material. 2404.7.2 Protection of…
2404.8 Sources of ignition. ¶
2404.8 Sources of ignition. Control of sources of ignition shall be in accordance with Section 2403.2 and Sections 2404.8.1 through 2404.8.2.4. 2404.8.1 Drying operations. Spray booths and spray rooms shall not be alternately used for the purpose of drying by arrangements or methods that could cause an increase in the surface temperature of the spray booth or spray room except in accordance with Sections 2404.8.1.1 and 2404.8.1.2. Except as specifically provided in this section, drying or baking units utilizing a heating system having open flames or that are capable of producing sparks shall…
2404.9 Ventilation. ¶
2404.9 Ventilation. Mechanical ventilation of flammable vapor areas shall be provided in accordance with Section 502.7 of the Cali- fornia Mechanical Code . 2404.9.1 Operation. Mechanical ventilation shall be kept in operation at all times while spraying operations are being conducted and for a sufficient time thereafter to allow vapors from drying coated articles and finishing material residue to be exhausted. Spraying equipment shall be interlocked with the ventilation of the flammable vapor areas such that spraying operations cannot be conducted unless the ventilation system is in…
2404.10 Interlocks. ¶
2404.10 Interlocks. Interlocks for spray application finishes shall be in accordance with Sections 2404.10.1 through 2404.10.2. 2404.10.1 Automated spray application operations. Where protecting automated spray application operations, automatic fireextinguishing systems shall be equipped with an approved interlock feature that will, upon discharge of the system, automatically stop the spraying operations and workpiece conveyors into and out of the flammable vapor areas. Where the building is equipped with a fire alarm system, discharge of the automatic fire-extinguishing system shall also…
2404.11 Limited spraying spaces. ¶
2404.11 Limited spraying spaces. Limited spraying spaces shall comply with Sections 2404.11.1 through 2404.11.4. 2404.11.1 Job size. The aggregate surface area to be sprayed shall not exceed 9 square feet (0.84 m [2] ). 2404.11.2 Frequency. Spraying operations shall not be of a continuous nature. 2404.11.3 Ventilation. Positive mechanical ventilation providing not fewer than six complete air changes per hour shall be installed. Such system shall meet the requirements of this code for handling flammable vapor areas. Explosion venting is not required. 2404.11.4 Electrical wiring. Electrical…