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9.32.3.5.(10)
ApplicationIntent
OH1
ObjectiveOH1 Indoor Conditions
Attribution
[F40,F50,F52-OH1.1]
Application
Application 1: 
Distribution of outdoor air in self-contained heating-season mechanical ventilation systems that are not coupled to forced air heating 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 9.32.3.5.(11), which applies to dwelling units in which:
    • every storey has a bedroom,
    • an exhaust air intake for the principal ventilation fan is located in the principal living area, and
    • no more than 2 exhaust air intakes are located in other rooms, 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 of the localized accumulation of pollutants and humidity and a lack of fresh air.
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, which could lead to harm to persons.
Intent 2: 
To exempt dwelling units in which every storey has a bedroom from the requirement in Clause 9.32.3.5.(10)(c) to supply outdoor air to the principal living area, in situations where the living area receives an adequate supply of outdoor air from other rooms in that storey [see Sentence 9.32.3.5.(11)].
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