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9.32.3.2.(1)
OS2OH1
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Design, construction and installation of self-contained heating-season mechanical ventilation systems serving single dwelling units with 5 or fewer bedrooms that are supplied with electrical power, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Application 2: 
This also applies to self-contained heating-season mechanical ventilation systems serving only one dwelling unit with 5 or fewer bedrooms, in buildings where ventilation is provided in accordance with Subsection 6.2.2. [see Sentence 6.2.2.1.(3)].
Exceptions: 
except:
  • as stated in Sentence 9.32.3.1.(1), which applies to mechanical ventilation systems designed to comply with CAN/CSA-F326-M, or
  • as specifically described in this Subsection.
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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 the inadequate control of:
  • airborne pollutants,
  • oxygen and other components necessary for breathable air, or
  • relative humidity, which could lead to 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.
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