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9.9.4.6.(1)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Protection of openings in the exterior walls of fire compartments, where:
  • exterior exit doors in other fire compartments are within 3 m horizontally of the openings, and
  • the exterior walls of these fire compartments intersect at an exterior angle of less than 135°.
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 through openings in the exterior walls of one fire compartment to an outside area near the exterior exit door of another fire compartment, 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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