3.1.5.18. Combustible Ducts

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3.1.5.18. Combustible Ducts

1) Except as required by Sentence 3.6.4.3. (1), combustible ducts, including plenums and duct connectors, are permitted to be used in a building required to be of noncombustible construction provided these ducts and duct connectors are used only in horizontal runs.

2) Combustible duct linings, duct coverings, duct insulation, vibration isolation connectors, duct tap, pipe insulation and pipe coverings are permitted to be used in a building required to be noncombustible construction provided they conform to the appropriate requirements of subsection 3.6.5.

3) In a building required to be of noncombustible construction, combustible ducts need not comply with the requirements of Sentence 3.6.5.1.(1) and (2) provided the ducts are

a)part of a duct system conveying only ventilation air, and

b)contained entirely within a dwelling unit.