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9.33.6.7.(1)
OH1OS3
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Air duct distribution systems serving garages and only one dwelling unit, where the heating system has a rated heat input that does not exceed 120 kW, 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 ingress of carbon monoxide into dwelling units, which could lead to the acute poisoning or asphyxiation of persons.
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