Sentence 3.4.4.2.(2)

  1. OS1

Objective

OS1 Fire Safety

Attribution

Intent

Intent 1:

To supersede the requirements of Sentence 3.4.4.1.(1) for a rated fire separation and of Sentence 3.4.4.2.(1) prohibiting exits to lead through lobbies, if certain measures are taken.

This is to limit the probability that:

  • excessive height above grade of the lobby will delay 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,
  • excessive travel distances through the lobby will lead to delays in evacuating, which could lead to harm to persons, and
  • smoke from a fire in a room, premise or interconnected floor space, or a fire in an adjacent occupancy, will spread into the lobby, 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.
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