Aluminum foil HVAC tape for joining and sealing joints, connections and seams on rigid fiberglass ductboard and flexible air duct, and 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.