Z-FLEX 4" x 25 Ft. Fab 4-M Fabriflex Duct, R6 (Insulated)

This remarkable high pressure insulated flexible duct, Fab 4T consists of a core made from vinyl coated fiberglass cloth which is mechanically locked together by a corrosive resistant galvanized steel helix. The liner is draped with thick fiberglass insulation and covered by a mylar sleeve. The unsurpassed properties of this ULC-S110 and UL-181 Class 1 product combines the rugged puncture resistant fabric with a highly dependable insulated vapor barrier to create a superior high pressure thermal duct ideal for commercial or institutional HVAC use. Pressure Rated: 25" w.g. positive 10" w.g. neg thru 12" dia. 5" w.g. neg 14" & 16" dia. 1" w.g. neg. 18" & 20" dia Rated Velocity: 5500 F.P.M. Core: PVC Coated Fiberglass Cloth Vapour Barrier Permeance: .05 Perm A.S.T.M. E96 Procedure A Duct Rated Note: This product is compressed by the manufacturer and then packaged for shipping purposes. To reach the specified length, the product needs to be unpackaged and stretched.