510.8 Underground 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) § 510.8 · Effective January 1, 2026 · Official source: Building Standards Commission
Grease ducts installed underground shall be approved for underground installation. The material of the grease duct shall be corrosion-resistant and shall comply with Section 510.5.1.
510.8.1 Grease Receptacle. The grease duct shall be sloped to drain the grease back to an approved grease collection device. A grease collection device shall be located at the base of the vertical riser.
510.8.2 Cleanouts. For horizontal installations, cleanouts for cleaning and maintenance shall be provided
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EXHAUST SYSTEMS
on the top portion of the grease duct in accordance with Section 510.3 and shall be labeled at the interior portion of the duct.
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