duct air flex 5inx25ft silver master flow 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