505.6 Fire Dampers — 2025 California Mechanical Code
California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-09-25 · California
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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) § 505.6 · Effective January 1, 2026 · Official source: Building Standards Commission
Fire dampers shall be permitted to be installed in exhaust systems in accordance with the following:
(1) Where ducts pass through fire barriers
(2) Where a collection system installed on the end of the system is protected with an automatic extinguishing system
(3) Where the duct system is protected with an automatic extinguishing system
(4) Where ducts have been listed with interrupters
(5) Where necessary to facilitate the control of smoke pursuant to the applicable NFPA standards [NFPA 91:4.2.9] 505.6.1 Prohibited. Fire dampers shall not be installed if the material being exhausted is toxic and if a risk evaluation indicates that the toxic hazard is greater than the fire hazard. [NFPA 91:4.2.10]
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