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9.33.6.14.(3) | Application | Intent |
| OS1 | OP1 |
| Objective | OS1 Fire Safety |
| Attribution | |
| Application | Application 1: Noncombustibility of return
ducts, in air duct distribution systems serving solid-fuel-burning furnaces 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]. |
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| Intent | Intent 1: To limit the probability of the ignition of return ducts
by heat (transferred from excessively hot air) that has entered the return
ducts upon failure of a circulating fan or other bonnet-temperature-limiting
device, which could lead to harm to persons. |
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