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9.33.6.4.(6) | Application | Intent |
| OS1 | OP1 |
| Objective | OS1 Fire Safety |
| Attribution | |
| Application | Application 1: Foamed plastic insulation used in ceiling spaces that
act as return air plenums 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]. |
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| Intent | Intent 1: To limit the probability that foamed plastic, once ignited,
will contribute to the rapid spread of fire and smoke throughout the building,
which could lead to harm to persons. Intent 2: To expand the application of Sentence (5) to
include situations where the foamed plastic insulation is protected from exposure
to the plenum by an acceptable thermal barrier. Intent 3: To expand the application of Sentence 3.1.5.12.(2).
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