Aluminum foil HVAC tape for joining and sealing joints, connections and seams on rigid fiberglass ductboard and flexible air duct, and as a UL 181A-P listed product, can also be used in place of mechanical fasteners on rigid ductboard. UL 181A-P/B-FX Listed and printed, AF 099 delivers full system closure by forming airtight bonds on joints and seams in temperatures ranging from -20 F to 260 F and in humid conditions.