ATCO: Flexible Duct Systems: Flex Model: ATCOR 4,2 Insulation, UL 181 Listed For Use in Medium Pressure Supply and Return Duct Metalized Polyster Jacket Maximum Velocity of 5000 FPM 25' Per BagATCO Flex Model_ATCO$0.00PriceExcluding Sales TaxSizeSelectLength25'QuantityAdd to Quote