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9.21.3.9.(1)
OS2OP1OH1OS3OS1
ObjectiveOS2 Structural Safety
Attribution
(b) [F20-OS2.3]
Application
Application 1: 
Mortar bed for chimney liners for rectangular masonry or concrete chimneys that are not more than 12 m in height, for solid-fuel-burning 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 flue gas condensate will leak from joints in chimney liners, which could lead to corrosion or freeze-thaw damage to surrounding masonry, which could lead to the structural failure of the chimney, which could lead to harm to persons.
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