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9.32.3.5.(2) | Application | Intent |
OH1 | OS3 |
Objective | OS3 Safety in Use |
Attribution | |
Application | Application 1: Capacity of outdoor air supply fans installed to provide
outdoor air to self-contained heating-season mechanical ventilation systems
that are not coupled to forced air heating systems, serving single dwelling
units with 5 or fewer bedrooms that are supplied with electrical power
and a heating system, in buildings to which:
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 an outdoor air supply fan
will not be installed or that an inadequately sized outdoor air supply fan
will be installed, which could lead to the excessive depressurization of dwelling
units, which could lead to the spillage of combustion products from fuel-burning
appliances that are susceptible to spillage. This is to
limit the probability of the entry of carbon monoxide gas into living space,
which could lead to the acute poisoning or asphyxiation of persons.
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