The Ontario Building Code | Smoke Control
3.2.8.9. Smoke Control
(1) A smoke control system conforming to Sentences (2) to (8) shall be designed to control the movement of smoke within a buildingcontaining an interconnected floor space.
(2) The design of the smoke control system shall assume an outdoorref ="http://thehandyforce.com/doors/" title ="Toronto Door installer">door temperature equal to the January design temperature on a 2.5% basis.
(3) Upon activation of the sprinkler system or automatic detection of smoke by at least two smoke detectors in a single zone within an interconnected floor space, the system shall,
(a) stop air moving fans that provide for the normal exhausting or re-circulating of air in an interconnected floor space,
(b) activate exitstairshaft protection required in Article 3.2.8.4.,
(c) activate elevator protection required in Article 3.2.8.5., and
(d) activate the vestibule air supply required in Sentence 3.2.8.6.(1).
(4) A building containing an interconnected floor space may be designed so that, in the event of a fire arising in a floor area or part of a floor area within the interconnected floor space, automatic detection of such fire will activate air handling equipment that,
(a) extracts air directly from such floor area or part of a floor areaat the rate of at least six air changes per hour, and
(b) supplies air in sufficient quantities and at appropriate locations to prevent smoke from passing out of such floor area into other portions of the interconnected floor space.
(5) For purposes of Sentences (6) and (7), the volume of an interconnected floor space need not include the aggregate volume of those floor areas or portions of floor areas designed to have zoned air extraction in accordance with Sentence (4).
(6) A mechanical exhaust shall be provided to remove air at the top of an interconnected floor space at the rate of at least six air changes per hour, except that where the volume of the interconnected floor space exceeds 17 000 m3, only four air changes per hour need be provided.
(7) Except where zoned mechanical exhaust described in Sentence (4) has been activated, upon automatic detection of smoke within the volume of the interconnected floor space, the mechanical exhaust described in Sentence (6) shall be automatically activated and supply air shall be provided in sufficient quantity and at appropriate locations to allow a consistent rate of removal of smoke throughout the volume of the interconnected floor space.
(8) Overriding manual controls for the smoke control system shall be provided for fire department use at an acceptable location in the vicinity of the fire alarm annunciator.