ARCHIVED - 9.32.3.8.(2)

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9.32.3.8.(2)


Objective	OS3 Safety in Use
Attribution	(a) [F43,F50,F53-OS3.4]
Application	Application 1: Supply of outdoor makeup air to mechanical air-exhausting devices in dwelling units that: contain fuel-fired space- or water-heating appliances that are not direct-vented or mechanically vented, or are located in an area where soil gas is deemed to be a problem but they do not incorporate a soil gas mitigation system. 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 the supply of outdoor air to replace air exhausted by the principal ventilation fan operating at a rate not greater than the maximum permitted in Table 9.32.3.3. [see Articles 9.32.3.4. and 9.32.3.5.], as stated in Sentence 9.32.3.8.(8), which exempts dwelling units with solid-fuel-burning appliances from the requirement for outdoor makeup air when all other fuel-fired appliances are direct-vented or mechanically vented and soil gas is not a concern, as stated in Sentence 9.32.3.8.(9), which exempts dwelling units from the requirement for outdoor makeup air, where a test performed in accordance with the procedures in CAN/CGSB-51.71 indicates that the maximum depressurization levels will be within acceptable limits, 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: [Clause (a)] To limit the probability of 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.
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