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9.33.6.6.(3)
OH1OS1OS2OP1
ObjectiveOP1 Fire Protection of the Building
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 joints opening, which could lead to combustible building elements being exposed to heat radiated from furnace heat exchangers, which could lead to fire, which could lead to damage to the building.
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