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9.33.6.6.(2)
OS1OS3OH1OS2
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Support for 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:
  • sagging or misaligned ducts, which could lead to inadequate clearances, which could lead to the ignition of combustible materials, or
  • the ignition of duct supports from the heat transferred from the ducts.
This is to limit the probability of fire, which could lead to harm to persons.
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