Hoods, filters and ducts

2.6.1.3. (1) Hoods, ducts and filters subject to accumulations of combustible deposits shall be checked at intervals not greater than seven days, and shall be cleaned if the accumulation of combustible deposits creates a fire hazard.

(2) Sentence (1) does not apply to hoods, ducts or filters in an exhaust or ventilating system that serves only a single suite of residential occupancy