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9.33.6.4.(3) | Application | Intent |
OS1 | OP1 |
Objective | OS1 Fire Safety |
Attribution | |
Application | Application 1: Maximum flame-spread rating and
smoke developed classification of the outer covering of ducts, plenums and
other parts of air duct distribution systems serving heating systems within
an assembly of combustible construction, 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 that covering materials will contribute
to the spread of fire and smoke throughout the building, which could lead
to harm to persons. Intent 2: To expand the application of Sentence 9.33.6.4.(2) to
include situations where coverings and linings used in air duct systems are
installed within an assembly of combustible construction. |
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