Section 120.9 — MANDATORY REQUIREMENTS FOR COMMERCIAL BOILERS — 2025 California Energy Code (Title 24, Part 6)

(a) Combustion air positive shut-off shall be provided on all newly installed boilers as follows: 1. All boilers with an input capacity of 2.5 MMBtu/h (2,500,000 Btu/h) and above, in which the boiler is designed to operate with a nonpositive vent static pressure. 2. All boilers where one stack serves two or more boilers with a total combined input capacity per stack of 2.5 MMBtu/h (2,500,000 Btu/h). (b) Boiler combustion air fans with motors 10 horsepower or larger shall meet one of the following for newly installed boilers: 1. The fan motor shall be driven by a variable speed drive, or 2.…

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