// CODE SNIPPET
604.1.1 Within Duels or Plenums
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Materials installed within ducts and plenums for insulating, sound deadening,
or other purposes shall have a mold, humidity, and erosion-resistant surface where tested in accordance with
UL 181. Duct liners in systems operating with air velocities
exceeding 2000 feet per minute (10.16 m/s) shall be
fastened with both adhesive and mechanical fasteners,
and exposed edges shall have approved treatment to
withstand the operating velocity. Where the internal insulation
is capable of being in contact with condensates or
other liquids, the material shall be water-resistant.
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