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9.32.3.4.(9) | Application | Intent |
OH1 | OS3 | OS2 |
Objective | OH1 Indoor Conditions |
Attribution | |
Application | Application 1: Activation of fans 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: [Clauses (a) and (b)] To limit the probability of the operation
of principal ventilation fans when outdoor air supply and furnace circulation
fans are not operating, which could lead to excessive depressurization, which
could lead to:
This is to limit the probability of the inadequate
control of:
This is to limit the probability of negative effects on the air
quality of indoor spaces, which could lead to harm to persons.
Intent 2: [Clause (c)] To limit the probability of the operation of
supply fans when principal ventilation fans are not operating, which could
lead to excessive pressurization, which could lead to condensation within
assemblies, which could lead to the generation of pollutants from biological
growth or from materials that become unstable on wetting. This
is to limit the probability of negative effects on the air quality of indoor
spaces, which could lead to harm to persons.
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