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7.3.8.1.(2)
ApplicationIntent
OS1
ObjectiveOS1 Fire Safety
Attribution
[F82-OS1.2,OS1.5]
Application
Application 1: 
Testing of pressurized stair and elevator shafts associated with Measure G, where Measure G is used to limit smoke movement as provided in Commentary C of the User's Guide - NBC 1995 (Part 3).
This applies to high buildings, as defined in Sentence 3.2.6.1.(1) of the National Building Code of Canada:
  • of Group A, D, E or F major occupancy classification that is more than:
    • 36 m high, measured between grade and the floor level of the top storey, or
    • 18 m high, measured between grade and the floor level of the top storey, and in which the cumulative or total occupant load on or above any storey above grade, other than the first storey, divided by 1.8 times the width in metres of all exit stairs at that storey, exceeds 300,
  • containing a Group B major occupancy in which the floor level of the highest storey of that major occupancy is more than 18 m above grade,
  • containing a floor area or part of a floor area located above the third storey designed or intended as a Group B, Division 2 occupancy, and
  • containing a Group C major occupancy whose floor level is more than 18 m above grade.
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Intent
Intent 1: 
To limit the probability that inadequate air movement through stair and elevator shafts will go unnoticed, which could lead to the smoke control systems not operating as originally intended in a fire situation, which could lead to the buildup of smoke in exit stair shafts or elevator shafts, which could lead to:
  • delays or inefficiencies in emergency suppression operations, which could lead to the spread of fire, which could lead to harm to persons, including emergency responders, and
  • delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
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