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9.32.3.10.(1)
ApplicationIntent
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
[F53,F63-OS2.3]
Application
Application 1: 
Capacity ratings for required fans, in self-contained heating-season mechanical ventilation systems serving single dwelling units with 5 or fewer bedrooms that are supplied with electrical power and a heating system, in buildings to which:
  • Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], or
  • Part 6 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 6 and Sentence 6.2.2.1.(3)].
Exceptions: 
except as stated in:
  • Sentence 9.32.3.1.(1), which applies to heating-season mechanical ventilation systems designed to comply with CAN/CSA-F326-M, or
  • Sentence 9.32.3.10.(4), which applies to heat recovery ventilators used to provide one or more required fans.
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Intent
Intent 1: 
To limit the probability that the outdoor air supply flow will exceed the exhaust capacity of the mechanical air exhausting devices, which could lead to excessive positive pressure within the dwelling unit, which could lead to condensation within the building envelope, which could lead to the deterioration of building elements, which could lead to structural failure, which could lead to harm to persons.
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