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9.21.4.8.(1)
OS2OP1OS1OP2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Materials for walls of rectangular masonry 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 of an insufficient resistance to wind loads, which could lead to the structural failure of chimneys, which could lead to harm to persons.
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