All exhaust duct piping, sizes 6" through 24", shall be
CPVC seamless extruded type, as manufactured by Harvel Plastics,
Inc. This duct pipe shall be extruded from Chlorinated Polyvinyl
Chloride (CPVC) compound with a Cell Classification of 23447 per
ASTM D1784; trade name CPVC. All extruded duct pipe shall meet Harvel
Plastics, Inc. published standards with regard to material and dimensions,
and shall carry a maximum temperature rating of 200ªF. All extruded
duct pipe shall be manufactured in the USA, using domestic materials,
by an ISO 9001 certified manufacturer, and shall be stored indoors
at the manufacturing site until shipped from the factory. All extruded
CPVC duct pipe shall be marked with the manufacturer’s name
or identifying symbol, and the CPVC material trademark.
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