JVCC AF20-CW Cold Weather Aluminum Foil Tape is a cold weather, premium grade, aluminum foil tape (with liner) used for HVAC applications. It is recommended for use on fiberglass duct boards. Ideal for permanent flexible seals. For use as a closure material on fiberglass duct systems and on flexible air ducts and closures. Also can provide a durable seal for dryer ventilation and on rigid sheet metal ducts. The tape is coated with a high performance aggressive acrylic adhesive which is protected by bleached Kraft paper liner which also provides easy unwind. The adhesive is good even at extremely low or high temperatures.