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9.21.4.9.(1)
OH1OP1OS2OS3OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Separation of flue liners in the same rectangular chimney of brick masonry or concrete, which is not more than 12 m in height and serves 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 a chimney fire in one flue liner will lead to a fire in adjacent flue liners, which could lead to the ignition of combustible building components, which could lead to harm to persons.
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