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9.10.18.4.(1)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Design, with respect to preventing the circulation of smoke, of a recirculating air handling system, where the air handling system:
  • supplies more than one suite on the same floor, or
  • serves more than 1 storey.
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] where fire alarm systems are required [see Article 9.10.18.2.].
Exceptions: 
except for recirculating air systems serving not more than one dwelling unit.
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Intent
Intent 1: 
To limit the probability that smoke will spread between storeys or suites by means of an air handling system, which could lead to harm to persons.
Intent 2: 
To limit the probability that smoke originating from a fire in an air handling system will spread through the duct system, which could lead to harm to persons.
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