6.3.2.7.Interconnection of Systems

(1) In a residential occupancy, air from one suite shall not be circulated to any other suite or to a public corridor. (2) Except as permitted by Sentences (3) and 6.3.2.10.(6), air duct systems serving storage garages shall not be directly interconnected with other parts of the building. (3) Exhaust ducts referred to in Sentence 6.3.2.10.(10) are permitted to exhaust through an enclosed storage garage prior to exhausting to the outdoors, provided (a) the storage garage exhaust system runs continuously, (b) the capacity of the storage garage exhaust system is equal to or exceeds the volume of the exhaust entering the garage, and (c) a leakage rate 1 smoke/fire damper rated in accordance with CAN/ULC-S112.1, “Standard for Leakage Rated Dampers for Use in Smoke Control Systems,” is provided near the duct outlet location in the storage garage to prevent air from the storage garage from entering the exhaust ductwork system in the event the building's exhaust fan is shut down. (4) Except for corridors conforming to Sentence 3.3.1.4.(4) or as permitted in Sentences (5) and (6), a public corridor or corridor serving the public shall not be used as a portion of a supply, return or exhaust air system serving adjoining areas, other than as part of a supply air system serving toilet rooms, bathrooms, shower rooms and similar auxiliary spaces opening directly to the public corridor or corridor used by the public. (5) A public corridor may be used as part of an engineered smoke control system. (6) Infiltration due to corridor pressurization is permitted into a residential occupancy from a public corridor.