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9.21.4.6.(1) | Application | Intent |
OS2 | OS1 | OP1 | OH1 | OS3 |
Objective | OH1 Indoor Conditions |
Attribution | |
Application | Application 1: Waterproof caps 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 cracks in the masonry or gaps
between the masonry and the liner will lead to the ingress of precipitation
or melting snow into the chimney, which could lead to damage to the masonry
or to the liner due to freeze-thaw stresses, which could lead to the leakage
of flue gases into living space, which could lead to negative effects on the
air quality of indoor spaces. This is to limit the probability
of harm to persons.
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