Feature●R6 fiberglass insulation for greater insulating power●Flexible duct is convenient for use in multiple applications including heating and A/C systems and some venting●Oversized core to connect quickly and easily to standard sheet metal fitting●Galvanized core wire for greater corrosion resistance vs non-galvanized wire●Duct can be cut to length as neededDescription Master Flow F8IFD10X300 Insulated Flexible Duct 10 in Fiberglass Silver