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9.33.6.4.(2) | Application | Intent |
| OS1 | OP1 |
| Objective | OS1 Fire Safety |
| Attribution | |
| Application | Application 1: Maximum flame-spread rating and
smoke developed classification of combustible coverings
and linings and associated adhesives and insulation of air ducts, plenums and
other parts of 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].
Exceptions:
except as stated in Sentence 9.33.6.4.(3), which applies to
the outer covering of ducts, plenums and other parts
of air duct systems used within an assembly of combustible
construction.
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 combustible coverings, linings
and associated adhesives and insulation will contribute to the spread of fire
and smoke throughout the building, which could lead to harm to persons.
|
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