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3.6.3.2.(1)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Protection of foamed plastic insulation in vertical service spaces, in buildings described in Sentence 1.3.3.2.(1).
Application 2: 
This also applies to chutes and shafts in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], as stated in Sentence 9.10.1.2.(7), except where the chute or shaft is entirely contained within a dwelling unit.
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Intent
Intent 1: 
To limit the probability that fire in a vertical service space will ignite foamed plastic insulation lining the service space, which could lead to the spread of fire to other parts of the building, which could lead to harm to persons.
Intent 2: 
To expand the application of Article 3.1.5.12. [more specifically Sentence 3.1.5.12.(2)], which would otherwise apply only to buildings described in Sentence 1.3.3.2.(1) of Division A that are required to be of noncombustible construction.
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