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9.32.3.5.(6) | Application | Intent |
OH1 | OS2 | OS3 |
Objective | OS3 Safety in Use |
Attribution | |
Application | Application 1: Airflow measurement and adjustment of flow-regulating
dampers in outdoor air supply ducts in 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 the normal operating exhaust
capacity of the principal ventilation fan will exceed the outdoor air supply
flow, which could lead to depressurization of the dwelling unit, 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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