California Code, Health and Safety Code - HSC § 114149.1

(a) Mechanical exhaust ventilation equipment shall be provided over all cooking equipment as required to effectively remove cooking odors, smoke, steam, grease, heat, and vapors. All mechanical exhaust ventilation equipment shall be installed and maintained in accordance with the California Mechanical Code, except that for units subject to Part 2 (commencing with Section 18000) of Division 13, an alternative code adopted pursuant to Section 18028 shall govern the construction standards.

(b) Restricted food service facilities shall be exempt from subdivision (a), but shall still provide ventilation to remove gases, odors, steam, heat, grease, vapors and smoke from the food facility. In the event that the enforcement officer determines that the ventilation must be mechanical in nature, the ventilation shall be accomplished by methods approved by the enforcement agency.

(c) This section shall not apply to cooking equipment when the equipment has been submitted to the local enforcement agency for evaluation, and the local enforcement agency has found that the equipment does not produce toxic gases, smoke, grease, vapors, or heat when operated under conditions recommended by the manufacturer. The local enforcement agency may recognize a testing organization to perform any necessary evaluations.

(d) Makeup air shall be provided at the rate of that exhausted.