Master Flow 4 in. x 25 ft. Insulated Flexible Duct R6 Silver Jacket

The Master Flow 4 in. x 25 ft. Insulated Flexible Duct R6 Silver Jacket is used in standard Heating and Air Conditioning (HVAC) systems and some venting applications. The duct has R6 insulation which contains 33% more insulation than the standard R4.2 product. This additional insulation provides greater thermal efficiency to save energy. The product is also covered in a heavy duty, silver jacket for durability. The duct is ETL listed, meeting the UL181 standard.|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 needed|Insulated duct features a maximum temperature rating of 200 degree F|Always install per instructions and seal using approved mastic or sealant (or approved tape)