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9.32.3.10.(3)
OH1OS3
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Static pressure differentials for rating the capacity of 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, and
  • Sentence 9.32.3.10.(4), which applies to heat recovery ventilators used to provide one or more required fans.
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Intent
Intent 1: 
To limit the probability that the airflow resistance of ducts will not be taken into account, which could lead to inadequate ventilation where fans perform significantly below the required capacity.
This is to limit the probability of:
  • moisture ingress from the ground,
  • the ingress of soil gases (such as methane and radon),
  • the spillage of combustion products from fuel-burning appliances that are susceptible to spillage, or
  • the inadequate control of relative humidity.
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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