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9.33.6.2.(2)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
(a),(b),(c),(d) [F01-OS1.1]
Application
Application 1: 
Combustible material in ducts, associated fittings and plenums used 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 exempt ducts, associated fittings and plenums from the application of Sentence 9.33.6.2.(1), where certain criteria are met.
This is to limit the probability of the ignition of combustible duct system components, which could lead to the spread fire and smoke throughout the building, which could lead to harm to persons.
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