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9.32.3.8.(9)
ApplicationIntent
OS3OH1
ObjectiveOS3 Safety in Use
Attribution
[F43,F50,F53-OS3.4]
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 that air-exhausting devices required by Sentence 9.32.3.8.(2) will operate without adequate replacement with outdoor air, which could lead to excessive negative pressure in dwelling units, which could lead to the spillage of carbon monoxide gas from fuel-burning appliances that are susceptible to spillage, which could lead to the acute poisoning or asphyxiation of 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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