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3.6.5.4.(6)
ApplicationIntent
OS1
ObjectiveOS1 Fire Safety
Attribution
[F02-OS1.2]
Application
Application 1: 
Foamed plastic insulation installed in a ceiling space that is used as a return air plenum, where the foamed plastic insulation is protected from exposure to the plenum in accordance with Article 3.1.5.12.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A.
Application 2: 
This also applies to:
  • the fire safety characteristics of heating, ventilating and air-conditioning systems, as stated in Article 6.2.1.2., and
  • buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], with respect to:
    • mechanical ventilation systems other than self-contained systems serving single dwelling units, as stated in Sentence 9.32.1.1.(2),
    • the ventilation of storage garages for more than 5 motor vehicles in residential occupancies, as stated in Sentence 9.32.1.1.(3),
    • mechanical ventilation systems used for the ventilation of rooms and spaces in dwelling units during the non-heating season, where natural ventilation is not provided in accordance with Article 9.32.2.2., as stated in Clause 9.32.2.1.(1)(b),
    • heating and air-conditioning systems other than those serving individual dwelling units, as stated in Sentence 9.33.1.1.(2), and
    • air duct distribution systems in which the rated heat input exceeds 120 kW, as stated in Sentence 9.33.6.1.(2).
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Intent
Intent 1: 
To exempt foamed plastic insulation installed in ceiling spaces from the requirements of Sentence 3.6.5.4.(5), which would otherwise prohibit its use, if certain conditions are met.
This is to limit the probability that foamed plastic insulation will not be protected by a thermal barrier, which could lead to the insulation contributing to the growth or spread of fire, which could lead to the spread of fire to other parts of the building by means of the ceiling space, 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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