Thermofin of Florida, Inc.       Service with a personal touch    Ultra 200 is the insulated line of semi-rigid corrugated, easily bent, aluminum metal duct that can be formed by hand into curves and small radius elbows. The inner core is our Ultra 100 Duct wrapped with one wrap of 1.5" thick, 75 lbs. density fiberglass covered with a tough 3mil thick seamless vinyl tube resisting the passage of moisture to 0.2 perms, and an overall"c" factor rating of 0.23 BTU's per hour, per square foot, per degree farenheit(F). ULTRA 300 insulated duct has the same engineering data and meets the same specifications as the ULTRA 200. The only exception is the outer jacket is a Foil Reinforced U.L. Listed Mylar Vapor Barrier. To contact us Phone: 954-771-0662 Fax: 954-771-0663 Email: jsperling@thermofinoffl.com