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9.21.2.4.(1)
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Application
Application 1: 
Chimney flues for rectangular masonry or concrete chimneys that are not more than 12 m in height that serve 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).
Exceptions: 
except for chimneys serving fireplaces.
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Intent
Intent 1: 
To direct Code users to Sentences 9.33.5.2.(1) and 9.33.5.3.(1), which list installation standards containing sizing requirements for chimneys.
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