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9.32.3.10.(1)
ApplicationIntent
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
[F40,F50,F52,F53-OH1.1] [F51,F52-OH1.2]
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 of excessive or insufficient airflow.
This is to limit the probability of:
  • the inadequate control of airborne pollutants or oxygen and other components necessary for breathable air,
  • the inadequate control of relative humidity,
  • excessive negative pressure, or
  • excessive positive pressure.
This is to limit the probability of:
  • condensation within assemblies, which could lead to the generation of pollutants from biological growth or from materials that become unstable on wetting,
  • moisture ingress from the ground,
  • the ingress of soil gases (such as methane and radon),
  • the spillage of combustion products from fuel-burning appliances that are susceptible to spillage, or
  • drafts.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces, or
  • the inadequate thermal comfort of persons.
This is to limit the probability of harm to persons.
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