The Ontario Building Code | Fire Separation for Exits
18.104.22.168. Fire Separation for Exits
(1) Except as provided in Sentence (5) and Article 22.214.171.124., every exitother than an exit doorway ="http://thehandyforce.com/doors/" title ="Toronto Door installer">doorway shall be separated from each adjacent floor area or from another exit by a fire separationhaving a fire-resistance rating not less than that required for the floor assembly above the floor area.
(2) Where there is no floor assembly above, the fire-resistance rating required in Sentence (1) shall not be less than that required by Subsection 9.10.8. for the floor assembly below, but in no case shall the fire-resistance rating be less than 45 min.
(3) Afire separation common to two exitsshall be smoke-tight and not be pierced by doorway ="http://thehandyforce.com/doors/" title ="Toronto Door installer">doorways, duct work, piping or any other opening that may affect the continuity of the separation.
(4) Afire separation that separates an exit from the remainder of the buildingshall have no openings="http://thehandyforce.com/windows/" title ="Window installer in Toronto">openings except those for electrical wiring, noncombustible conduit and noncombustiblepiping that serve only the exit, and for standpipes, sprinkler piping, exit doorway ="http://thehandyforce.com/doors/" title ="Toronto Door installer">doorways and wireref ="http://thehandyforce.com/electrical/" title ="Electricians in East York">wired glass and glass block permitted in Article 126.96.36.199.
(5) The requirements in Sentence (1) do not apply to an exterior exitpassageway provided the passageway has at least 50 per cent of its exterior sides open to the outdoorref ="http://thehandyforce.com/doors/" title ="Toronto Door installer">doors and is served by an exitstair at each end of the passageway.