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9.21.2.4.(2) | Application | Intent |
| OH1 | OS3 |
| Objective | OS3 Safety in Use |
| Attribution | |
| Application | Application 1: Minimum cross-sectional area of chimney flues for rectangular masonry or
concrete chimneys that are not more than 12 m in height
that serve only one appliance having a 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 back pressure, created when
gases flowing through a flue pipe encounter a chimney of lesser capacity,
will 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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