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9.33.6.6.(3)
OH1OS1OS2OP1
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Fitting of joints for round ducts, in air duct distribution systems serving heating systems in which the rated heat input does not exceed 120 kW and serving only one dwelling unit, 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 ventilation ducts and their fittings, as stated in Sentence 9.32.3.11.(1).
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Intent
Intent 1: 
To limit the probability of excessive air leakage, which could lead to an inability to maintain the minimum indoor air temperatures [see Sentence 9.33.3.1.(1)], which could lead to condensation, which could lead to deterioration, which could lead to compromised structural integrity, which could lead to harm to persons.
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