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9.9.4.4.(1)
ApplicationIntent
OS1
ObjectiveOS1 Fire Safety
Attribution
[F05-OS1.5]
Application
Application 1: 
Protection of openings in exterior walls of buildings, where:
  • an unenclosed exterior exit stair or ramp provides the only means of egress from a suite,
  • the stair or ramp is exposed to fire from openings in the exterior walls of another fire compartment, and
  • the openings in the exterior walls of the building are within 3 m horizontally and less than 10 m below or less than 5 m above the exit stair or ramp.
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability that fire will spread from a fire compartment through openings in exterior building walls to an exterior exit stair or ramp, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
Intent 2: 
To expand the application of Articles 9.10.13.5. and 9.10.13.7. to include wired glass and glass blocks in openings in exterior walls under certain conditions.
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