Div. B › Part 3 › 3.1 › 3.1.8 — Fire Separations and Closures

3.1.8.17 — Temperature Rise and Area Limits Waived

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(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 closure between 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 a fire separation having a fire-resistance rating not less than 45 min,

(b) the fire separation required by Clause (a) contains no wired glass or glass block within 3 m of the closure into the exit enclosure, and

OBC Definitions

Defined terms on this page

closure

means a device or assembly for closing an opening through a fire separation or an exterior wall, such as a door, a shutter, a damper, wired glass and glass block, and includes all components such as hardware, closing devices, frames and anchors.

exit

means that part of a means of egress, including doorways, that leads from the floor area it serves to a separate building, an open public thoroughfare or an exterior open space protected from fire exposure from the building and having access to an open public thoroughfare.

fire separation

means a construction assembly that acts as a barrier against the spread of fire.

fire-resistance rating

means the time in minutes or hours that a material or assembly of materials will withstand the passage of flame and the transmission of heat when exposed to fire under specified conditions of test and performance criteria, or as determined by extension or interpretation of information derived from that test and performance as prescribed in this Code.

floor area

means the space on any storey of a building between exterior walls and required firewalls, including the space occupied by interior walls and partitions, but not including exits, vertical service spaces and their enclosing assemblies.

occupancy

means the use or intended use of a building or part of a building for the shelter or support of persons, animals or property.

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