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9.32.3.7.(4)
ApplicationIntent
OH1
ObjectiveOH1 Indoor Conditions
Attribution
[F40,F52-OH1.1]
Application
Application 1: 
Supplemental exhaust fans in bathrooms or water-closet rooms that do not have an exhaust air intake for the principal ventilation 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:
  • for bathrooms or water-closet rooms containing an exhaust air intake for the principal ventilation fan, and
  • as stated in 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 inadequate removal of vapours and pollutants present in bathrooms and water-closet rooms.
This is to limit the probability of the inadequate control of:
  • airborne pollutants, 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 bathrooms and water-closet rooms with an exhaust air intake from the requirement to install a supplemental exhaust fan, on the basis that the principal ventilation fan will extract humidity and airborne pollutants through its exhaust air intake.
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