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9.32.3.8.(9)
ApplicationIntent
OS3OH1
ObjectiveOH1 Indoor Conditions
Attribution
[F53-OH1.1]
Application
Application 1: 
Provision of makeup air in dwelling units that:
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 9.32.3.1.(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 excessive negative pressure, which could lead to:
  • 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
  • moisture ingress from the ground.
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 certain dwelling units from the requirement to provide makeup air [see Sentences 9.32.3.8.(1) to 9.32.3.8.(5)], where it can be shown using test procedures described in CAN/CGSB-51.71 that maximum depressurization levels will not likely cause the spillage of combustion products from fuel-fired appliances.
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