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9.21.3.8.(2) | Application | Intent |
| OS1 | OH1 | OS3 | OP1 | OS2 |
| Objective | OP1 Fire Protection of the Building |
| Attribution | |
| Application | Application 1: Clear space between chimney
liners 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, and surrounding masonry, 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, on severe overheating [i.e.
during a chimney fire], the expansion of the liners will put stress on the
masonry surrounding the flue liners, which could lead to the failure of surrounding
masonry or the displacement of liner sections, which could lead to the escape
of hot gases and flame, which could lead to the ignition of combustible building
components, which could lead to damage to the building. |
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