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6.2.3.9.(1)
ApplicationIntent
OS1OH1
ObjectiveOS1 Fire Safety
Attribution
[F44-OS1.1]
Application
Application 1: 
Circulation of air among suites, or between suites and public corridors, in buildings of residential occupancy described in Sentence 1.3.3.2.(1) of Division A.
Application 2: 
This also applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], with respect to:
  • mechanical ventilating systems other than self-contained systems serving single dwelling units, as stated in Sentence 9.32.1.2.(2),
  • the ventilation of all occupancies other than residential occupancies, as stated in Sentence 9.32.1.1.(2),
  • heating systems, including requirements for combustion air, and air-conditioning systems other than those serving individual dwelling units, as stated in Sentence 9.33.1.1.(2), and
  • air duct distribution systems serving heating systems in which the rated heat input exceeds 120 kW, as stated in Sentence 9.33.6.1.(2).
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Intent
Intent 1: 
To limit the probability that fire or smoke from one suite of residential occupancy will be transferred to other suites or to public corridors, which could lead to harm to persons.
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