Duck Brand 675590 HVAC UL 181A-P Listed Foil Tape for Rigid Ducts, 2.5-Inch by 50 Yards, Single Roll, Silver Ideal for metal, auto, aluminum repairs and HVAC applications Suitable for indoor and outdoor use HVAC foil tape is UL 181A-P listed for use on rigid fiberglass ducts Rated for flame spreads and smoke development Temperature range is (-20 degrees Fahrenheit to 260 degrees Fahrenheit)