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9.32.3.10.(4)
OH1
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Rating of the airflow provided by fans in heat recovery ventilators used to provide one or more required fans, 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 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 heat recovery ventilators will fall significantly below expectations, which could lead to inadequate ventilation.
This is to limit the probability of the inadequate control of:
  • airborne pollutants,
  • oxygen and other components necessary for breathable air, or
  • relative humidity and indoor air temperatures.
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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