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3.4.4.3.(1)
ApplicationIntent
OS1
ObjectiveOS1 Fire Safety
Attribution
[F05,F06,F10-OS1.5]
Application
Application 1: 
Exterior exit passageways, where:
  • not less than 50% of the exterior side is open to the outdoors, and
  • an exit stair is provided at each end of the passageway.
This applies to exits serving floor areas that are intended for occupancy, including mezzanines as stated in Sentence 3.4.2.2.(1), in buildings described in Sentence 1.3.3.2.(1) of Division A.
Application 2: 
This also applies to:
  • tents and air-supported structures, as stated in Sentences 3.1.6.1.(1) and 9.10.1.2.(1), and
  • exterior passageways leading to required exits, as stated in Sentence 3.3.1.15.(1).
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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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