UL 181A-P/B-FX Listed aluminum foil HVAC tape for joining and sealing joints, connections and seams on rigid fiberglass ductboard and flexible air duct. A tape that "does it all," AF 100 is engineered to form airtight bonds on joints and seams in temperatures ranging from -20 F to 260 F and in humid conditions to deliver full system closure. As a UL 181A-P listed product, AF 100 can be used in place of a mechanical fastener on rigid ductboard.