The Ontario Building Code | Interconnection of Systems

6.2.3.9. Interconnection of Systems

(1) In a residential occupancy, air from one suiteshall not be circulated to any other suite or to a public corridor or public stairway.

(2) Except as permitted by Sentence (3) and Sentence 6.2.3.8.(6), air duct systems serving storage garages shall not be directly interconnected with ductwork serving other areas of the building.

(3) Where exhaust ducts are provided in conformance with Sentence 6.2.3.8.(6), they may exhaust through an enclosed storage garage prior to exhausting to the outdoorref ="http://thehandyforce.com/doors/" title ="Toronto Door installer">doors 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, "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.