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9.10.12.3.(1)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Minimum horizontal distance between an opening in one exterior wall and an opening in another exterior wall, where:
  • the exterior walls of the building meet at an external angle of 135°, or less, and
  • the openings are in different fire compartments.
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 as stated in Sentence 9.9.4.5.(1), which applies to openings in exterior walls of exits.
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Intent
Intent 1: 
To limit the probability that fire will spread from one fire compartment to an adjacent fire compartment through unprotected openings in the exterior wall of the fire compartment of origin, which could lead to harm to persons in the adjacent fire compartment.
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