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9.18.7.1.(4) | Application | Intent |
| OS1 |
| Objective | OS1 Fire Safety |
| Attribution | |
| Application | Application 1: Noncombustible register
protection for crawl spaces whose exterior walls have less than 25% of their
total area above exterior ground level open to the outdoors, that are under
1-storey portions of dwelling
units and are used as warm-air plenums, 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 that debris, such as smouldering
cigarette butts, will fall through the floor register outside the protected
area and lead to the ignition of combustible materials in the crawl space
plenum, which could lead to harm to persons. |
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