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9.33.7.1.(1)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Noncombustible lining or backing for steam or hot water radiators and convectors in which the rated heat input does not exceed 120 kW and that are located in recesses or concealed spaces or attached to the face of walls of combustible construction, 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 long-term exposure of combustible materials to relatively low-grade heat, which could lead to the ignition of the combustible materials, which could lead to harm to persons.
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