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9.32.3.7.(7)
OH1
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Principal ventilation fan controls located in kitchens or bathrooms that are exempted from the requirement to install a supplemental exhaust fan.
This applies to 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 9.32.3.7.(3), which, in addition, requires the manual switch in the kitchen:
    • to be labelled, and
    • to switch the principal ventilation fan to a high exhaust rate,
  • Sentence 3.8.1.5.(1), which applies to barrier-free design in buildings described in Sentence 3.8.1.1.(1) [see Sentence 9.5.2.1.(1)], 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 occupants will:
  • be unable to control the principal ventilation fan when supplemental exhaust is required in bathrooms and kitchens, or
  • have difficulty finding the principal ventilation fan control or understanding the control's function.
This is to limit the probability of occupants being unaware of their ability to control ventilation fans, which could lead to fans not being used.
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.
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