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9.33.6.13.(1) | Application | Intent |
| OH1 | OS3 |
| Objective | OS3 Safety in Use |
| Attribution | |
| Application | Application 1: Placement of return-air inlets, 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]. |
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| Intent | Intent 1: To limit the probability of an inadequate supply of make-up
air, which could lead to negative pressure in a fire chamber upon operation
of a furnace distribution fan, which could lead to the flow of carbon monoxide
gas into the air distribution system, which could lead to the acute poisoning
or asphyxiation of persons. |
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