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9.22.5.2.(2)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Hearths for masonry fireplaces constructed on-site whose opening is raised not less than 200 mm from a combustible floor, 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 fireplaces 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 6.2.1.5.(1).
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Intent
Intent 1: 
To limit the probability that heat radiating from the fireplace opening to a hearth that rests directly on a combustible floor will raise the hearth temperature excessively, which could lead to the ignition of combustible building components, which could lead to harm to persons.
Intent 2: 
To exempt certain fireplaces from the application of Sentence 9.22.5.2.(1), where the fireplace opening is raised sufficiently above a combustible floor to reduce the risk of raising the hearth temperature excessively.
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