1BR6 - Flexmaster Insulated Flex Duct

Polyethylene fabric, mechanically locked to the duct helix without the use of adhesives. Made from corrosive resistant galvanized steel, the duct helix is mechanically formed to attach the duct fabric without the use of adhesives. Formaldehyde-free fiberglass insulation. Round flex duct, 25'L, Type 1, R6, +10" & -10" pressure class