The Ontario Building Code | Temperature Rise and Area Limits Waived
3.1.8.17. temperature Rise and Area Limits Waived
(1) The temperature rise limits and glass area limits required by Articles 3.1.8.15. and 3.1.8.16. are waived for a closurebetween an exit enclosure and an enclosed vestibule or corridor provided,
(a) the vestibule or corridor is separated from the remainder of the floor area by afire separation having a fire-resistance rating not less than 45 min,
(b) the fire separation required by Clause (a) contains no wireref ="http://thehandyforce.com/electrical/" title ="Electricians in East York">wired glass or glass block within 3 m of the closure into the exit enclosure, and
(c) the vestibule or corridor contains no occupancy.
In Plain Language
The temperature-rise and glass-area limits from the two preceding articles are waived for closures between an exit enclosure and an enclosed vestibule/corridor, provided that vestibule/corridor is itself separated by a 45-minute fire separation, has no wired glass/glass block within 3 m of the exit closure, and contains no occupancy.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.