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9.32.3.1.(1)
ApplicationIntent
OS3OH1
ObjectiveOH1 Indoor Conditions
Attribution
[F40,F50,F52-OH1.1] [F51,F52-OH1.2]
Application
Application 1: 
Heating-season mechanical ventilation systems serving single dwelling units 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)].
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Intent
Intent 1: 
To limit the probability that the performance of heating-season mechanical ventilation systems will fall significantly below expectations.
This is to limit the probability of:
  • inadequate ventilation, or
  • the inadequate control of relative humidity.
This is to limit the probability of the inadequate control of:
  • indoor air temperatures,
  • airborne pollutants,
  • oxygen and other components necessary for breathable air, or
  • condensation, which could lead to the generation of pollutants from biological growth or from materials that become unstable on wetting.
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.
Intent 2: 
[Clause (a)] To direct Code users to good practice options, such as those contained in CAN/CSA-F326-M, for the design of heating-season mechanical ventilation systems.
Intent 3: 
[Clause (b)] To state the application of Subsection 9.32.3., which contains requirements for heating-season mechanical ventilation systems in dwelling units with 5 or fewer bedrooms.
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