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9.32.3.3.(1)
OH1
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Required components of principal ventilation systems 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:
  • Article 9.32.3.6., which does not require provision for the introduction of outdoor air in dwelling units that meet certain conditions, and
  • Sentence 9.32.3.1.(1), which applies to heating-season mechanical ventilation systems designed to comply with CAN/CSA-F326-M.
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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 (b)] To direct Code users:
  • for dwelling units with forced air heating systems, to provisions regarding the introduction of outdoor air stated in Article 9.32.3.4.,
  • for dwelling units without forced air heating systems, to provisions regarding the introduction of outdoor air stated in Article 9.32.3.5., or
  • for dwelling units meeting certain conditions such that depressurization does not present a hazard to occupants, to Article 9.32.3.6., which permits exhaust-only ventilation systems.
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