510.6 Exterior Installations — 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) § 510.6 · Effective January 1, 2026 · Official source: Building Standards Commission
For cooking operations in buildings, the exterior portion of the ductwork shall be vertical wherever possible and shall be installed and supported on the exterior of a building. Bolts, screws, rivets, and other mechanical fasteners shall not penetrate duct walls. Clearance of ducts shall comply with Section 507.4 through Section 507.4.3.3. [NFPA 96:7.6.1, 7.6.3, 7.6.4]
EXHAUST SYSTEMS
510.6.1 Weather Protection. All ducts shall be protected on the exterior by paint or other suitable weatherprotective coating. Ductwork subject to corrosion shall not contact the building surface. {NFPA 96:7.6.5 – 7.6.7}
Exception: Ducts constructed of stainless steel shall not be required to have additional paint or weather-protective coatings.
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