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9.32.3.13.(11) | Application | Intent |
OH1 | OS3 |
Objective | OS3 Safety in Use |
Attribution | |
Application | Application 1: Net free area of screens and grilles installed on
air intake and exhaust openings, in 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:
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 of excessive restriction of airflow
through screens or grilles on air intake or exhaust openings, which could
lead to excessive negative pressure (where supply fans alone are restricted),
which could lead to the spillage of carbon monoxide gas from fuel-burning
appliances that are susceptible to spillage, which could lead to the acute
poisoning or asphyxiation of persons. |
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