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9.21.2.6.(1) | Application | Intent |
| OH1 | OS3 |
| Objective | OS3 Safety in Use |
| Attribution | |
| Application | Application 1: Minimum width of oval-shaped chimney flues for rectangular masonry or
concrete chimneys that are not more than 12 m in height
and that serve fireplaces or appliances having
a combined total rated heat output of 120 kW or less, 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 rectangular masonry
or concrete chimneys, in buildings to which
Part 6 applies [see Sentence 1.3.3.2.(1) of Division A for application
of Part 6], as stated in Sentence 6.3.1.2.(1). |
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| Intent | Intent 1: To limit the probability that an aerodynamically inefficient
flue shape will lead to an inadequate flow of flue gases, which could lead
to the spillage of combustion products, which could lead to the leakage of
carbon monoxide gas into living space, which could lead to the acute poisoning
or asphyxiation of persons. |
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