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9.33.6.7.(7) | Application | Intent |
| OH1 | OS2 | OS3 |
| Objective | OH1 Indoor Conditions |
| Attribution | |
| Application | Application 1: Drainage and access for underground ducts, in air
duct distribution systems serving heating systems in which the rated heat
input does not exceed 120 kW and serving only one dwelling
unit, in buildings to which Part 9 applies
[see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Application 2: This also applies to ventilation ducts and their fittings,
as stated in Sentence 9.32.3.11.(1). |
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| Intent | Intent 1: To limit the probability of the accumulation of water in
ducts, which could lead to:
This is to limit the probability of the generation
of pollutants from biological growth or from materials that become unstable
on wetting, which could lead to:
This is to limit the probability of harm to persons.
Intent 2: To limit the probability of the entry of sewer gases into
duct systems, which could, on system operation, lead to the distribution of
sewer gases throughout living spaces, which could lead negative effects on
the air quality of indoor spaces, which could lead to harm to persons.
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