The Ontario Building Code | Smoke Detectors in Recirculating Air Handling Systems

9.10.18.5. Smoke detectors in Recirculating Air Handling Systems

(1) Except for a recirculating air system serving not more than one dwelling unit, where a fire alarm system is required to be installed, every recirculating air handling system shall be designed to prevent the circulation of smoke upon a signal from a duct-type smoke detectorwhere such system supplies more than one suite on the same floor or serves more than 1 storey.