For 6-piece (72 feet) see

Sound attenuator flexible duct, 2" inside diameter, 6" outside diameter insulated to R8 with 2 vapor barriers; quantity of 1x 12' length with our Twist-Fit connectors on each end

Duct Size	2.0"
Duct Shape	Round
Material	Multiple
Flex or Rigid Duct	Flexible
R-Value	R8.0
Duct Connection Type	Twist-Fit System
Brand	Unico
Duct OD	6"
Duct Length	12 ft.
Vapor Barrier Qty	Double
Certifications	UL-181