Master Flow . F6IFD4X144

The Master Flow 4 in. x 12 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. It can be used for venting bath fans where insulation is required. The duct is ETL listed, meeting the UL181 standard.