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9.9.4.2.(4)
ApplicationIntent
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
[F05-OS1.5] [F03-OS1.2]
Application
Application 1: 
Openings in fire separations that separate exits from the remainder of the building, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except:
  • for openings for electrical wiring, noncombustible conduit and noncombustible piping that serve only the exit, and for standpipes and sprinkler piping,
  • for exits that serve not more than one dwelling unit, as stated in Sentence 9.9.4.1.(1),
  • as stated in Article 9.9.4.3., which applies to wired glass and glass block, and
  • as stated in Sentence 9.9.4.4.(1), which applies to openings near unenclosed exit stairs and ramps.
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Intent
Intent 1: 
To limit the probability that fire will spread through openings into 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 limit the probability that fire will spread from one floor area to another floor area by means of openings in exits, which could lead to harm to persons in the other floor area.
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