Sentence 3.4.4.3.(1)

  1. OS1

Objective

OS1 Fire Safety

Attribution

Intent

Intent 1:

To exempt exterior exit passageways from the requirements of Sentence 3.4.4.1.(1) for a rated fire separation, and of Sentences 3.2.3.13.(1) and (3) for the protection of openings, if certain measures are taken.

This is to limit the probability that:

  • smoke will build up in the exit, which could lead to untenable conditions in the exit, which could lead to:
    • delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons,
    • harm to persons, and
    • delays or ineffectiveness in fire emergency response operations, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons, including emergency responders, and
  • persons will not have a choice of an alternative egress route in the case of one route being blocked or obstructed in a fire situation, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
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