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9.32.3.4.(10) | Application | Intent |
| OH1 | OS3 | OS2 |
| 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 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 outdoor air supply flow
will be less than the normal operating exhaust capacity of the principal ventilation
fan, which could lead to excessive depressurization by exhaust fans, 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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