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9.21.2.3.(1)
OH1OS3
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Maximum incline of chimney flues for rectangular masonry or concrete 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 that an excessively long, non-vertical run in the length of a flue will contribute to the cooling of flue gases, which could lead to an inadequate draft, which could lead to the spillage of combustion products into living space, which could lead to negative effects on the air quality of indoor spaces, which could lead to harm to persons.
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