ARCHIVED - 9.32.3.8.(2)

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9.32.3.8.(2)


Objective	OS2 Structural Safety
Attribution	(b) [F53,F63-OS2.3]
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 (b)] To limit the probability that the outdoor makeup air supply flow will exceed the exhaust capacity of the mechanical air exhausting device, which could lead to excessive positive pressure within dwelling units, which could lead to condensation within the building envelope, which could lead to the deterioration of building elements, which could lead to structural failure, which could lead to harm to persons.
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