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Chapter 4 of the 2022 California Mechanical Code is adopted in its entirety subject to the modifications thereto which are set forth below:

405.4 Kitchen Exhaust. A mechanical exhaust directly to the outdoors shall be provided in each kitchen. The fan shall run intermittently (on demand) or continuously. A readily accessible manual control designed to be operated as needed or an automatic control shall be provided for intermittent operations.

405.4.1 Exhaust Rate. For intermittent-controlled operations, the exhaust rate shall be not less than 100 ft3/min (0.047 m3/s) for range hoods or 300 ft3/min (0.141 m3/s) for mechanical exhaust fans including downdraft appliances. and shall be rated for sound at a maximum of 3 sone at greater than or equal to 100 cfm. For continuous operated ventilation, the exhaust rate shall be not less than 5 air changes per hour based on kitchen volume for enclosed kitchens and shall be rated for sound at a maximum of 1.0 sone.

Exception: A vented range hood shall not be required in dwelling unit kitchens equipped with a local mechanical exhaust system installed in accordance with ASHRAE 62.2.

(Ord. 7839-NS § 4, 2022)