§ 73637. Air Filters.

(a) The licensee shall be responsible for regular inspection, cleaning or replacement of all filters installed in heating, air conditioning and ventilating systems, as necessary to maintain the systems in normal operating condition.

(b) A written record of inspection, cleaning or replacement, including static pressure drop, shall be maintained and available for inspection. The record shall include a description of the filters originally installed, the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) efficiency rating and the criteria established by the manufacturer or supplier to determine when replacement or cleaning is necessary.

(c) Following filter replacement or cleaning, the installation shall be visually inspected for torn media and bypass in filter frames by means of a flashlight or equivalent, both with fans in operation and stopped. Tears in filter media and bypass in filter frames shall be eliminated in accordance with the manufacturer's directions and as required by the Department.

(d) Where filter maintenance is performed by an equipment service company, a certification shall be provided to the licensee that the requirements listed in this section have been accommodated.