The Master Flow 5 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.<br />R6 fiberglass insulation for greater insulating power<br />Flexible duct is convenient for use in multiple applications including heating & A/C systems and some venting<br />Oversized core to connect quickly and easily to standard sheet metal fitting<br />Galvanized core wire for greater corrosion resistance vs. non-galvanized wire<br />Duct can be cut to length as needed<br />Insulated duct features a maximum temperature rating of 200 degrees Fahrenheit<br />Always install per instructions and seal using approved mastic or sealant (or approved tape)<br /><br />Dimensions<br />Product Depth (in.)<br />300<br />Product Diameter (in.)<br />5 in<br />Product Height (in.)<br />9<br />Product Length (in.)<br />300 in<br />Product Width (in.)<br />9