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9.9.4.5.(1)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Protection of openings in exterior walls of exits and of openings in adjacent exterior walls of buildings that the exits serve, where:
  • exit enclosures have exterior walls that intersect the exterior walls of the building at an angle of less than 135°, measured on the outside of the building, and
  • the openings in the exterior walls of the building are within 3 m horizontally and less than 2 m above the openings in the exterior walls of exits.
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except for exits that serve not more than one dwelling unit, as stated in Sentence 9.9.4.1.(1).
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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 exit, 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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