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9.33.6.8.(4) | Application | Intent |
| OS1 | OP1 |
| Objective | OS1 Fire Safety |
| Attribution | |
| Application | Application 1: Minimum clearance between combustible material
and supply ducts, in air duct distribution systems,
where the required plenum clearance is more than 150
mm, 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 9.33.6.8.(5), which applies to
registers installed in floors directly over a pipeless furnace,
where a double-walled register box with not less than 100 mm between
walls or a register box with the warm-air passage completely surrounded by
the cold-air passage is provided.
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| Intent | Intent 1: To limit the probability of the ignition of combustible
material by heat radiated from supply ducts, which could lead to harm to persons.
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