518.3 Fire-Extinguishing Equipment — 2025 California Mechanical Code
California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-09-25 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Mechanical Code (Title 24, Part 4) § 518.3 · Effective January 1, 2026 · Official source: Building Standards Commission
For fire-extinguishing equipment on downdraft appliance ventilation systems, the following shall apply:
(1) Cooking surface, duct, and plenum protection shall be provided.
(2) At least one fusible link or heat detector shall be installed within each exhaust duct opening in accordance with the manufacturer’s listing.
(3) A fusible link or heat detector shall be provided for each protected cooking appliance located in the plenum area of that appliance or in accordance with the extinguishing system manufacturer’s listing.
(4) A manual actuation device shall be provided as part of each appliance at a height acceptable to the Authority Having Jurisdiction.
(5) Portable fire extinguishers shall be provided in accordance with Section 513.10 through Section 513.11.
[NFPA 96:16.2]
518.3.1 Integral Fire-Extinguishing System. A listed downdraft appliance ventilation system employing an integral fire-extinguishing system including detection systems that has been evaluated for grease and smoke capture, fire extinguishing, and detection shall be considered as complying with Section 518.3. [NFPA 96:16.2.1]
518.3.2 Interlocks. The downdraft appliance ventilation system shall be provided with interlocks such that the cooking fuel supply will not be activated unless the exhaust and supply air systems have been activated.
[NFPA 96:16.2.2]
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