All exhaust duct piping, size 6" through 24", shall be
PVC seamless extruded type, as manufactured by Harvel Plastics Inc.
This duct pipe shall be extruded from a Type I, Grade I Polyvinyl
Chloride (PVC) compound with a Cell Classification of 12454 per
ASTM D1784. 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 140°F. 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
PVC duct pipe shall be marked with the manufacturer’s name
or identifying symbol.
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