Chapter 4 — SPECIAL DETAILED REQUIREMENTS BASED ON OCCUPANCY AND USE
442 Combustion Engines and Gas Turbines [sfm] — 2025 California Building Code
California Building Code (Title 24, Part 2) · 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 Building Code (Title 24, Part 2) § 442 · Effective January 1, 2026 · Official source: Building Standards Commission
442.1 General.¶
The installation of combustion engines and gas turbines shall be in accordance with NFPA-37 and this chapter.
442.2 Separation.¶
442.2.1 Construction. Every room in which is installed a combustion engine or gas turbine shall be separated from the remainder of the building by not less than a one-hour fire barrier.
442.2.2 Exterior openings. When doors, windows or louvered openings are located below openings in another story or less than 10 feet (3048 mm) from doors, windows or louvered openings of the same building, they shall be protected by a fire assembly having a 3 / 4 - hour rating. Such fire assemblies shall be fixed, automatic or self-closing.
442.2.2.1 Interior openings. In other than buildings housing Group I and R-2.1 occupancies, interior openings shall be allowed in buildings protected by an automatic fire sprinkler system throughout.
442.2.3 Location. Combustion engines and gas turbines used for emergency power shall not be located in a room or area used for any other purpose other than equipment and controls related to the generation and distribution of emergency power.
442.2.4 Special hazards. The handling and use of flammable or combustible liquids shall comply with the California Fire Code.
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