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9.33.6.11.(2) | Application | Intent |
| OS1 | OP1 |
| Objective | OS1 Fire Safety |
| Attribution | |
| Application | Application 1: Maximum flame-spread rating of combustible grilles, diffusers and other devices for
the supply and return air openings installed in walls and ceilings, 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 that combustible grilles, diffusers
and other devices will contribute to the rapid spread of fire across interior
exposed surfaces of walls and ceilings, which could lead to harm to persons.
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