512.1 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) § 512.1 · Effective January 1, 2026 · Official source: Building Standards Commission
Dampers shall not be installed in exhaust ducts or exhaust duct systems. [NFPA 96:9.1.1]
512.1.1 Use. Where specifically listed for such use or where required as part of a listed device or system, dampers in exhaust ducts or exhaust duct systems shall be permitted. [NFPA 96:9.1.2]
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