3M 3340 2-1/2 in. x 50 yds. Silver 4.0 mil Foil Tape (9 Rolls per Case)

The 3M Foil Tape 3340 is ideal for sealing rigid fiberglass duct boards and flexible air duct systems. Our tape meets requirements for UL 181 A-P and UL 181 B-FX Listings as a measure of reliability and quality standards. 2.0 mil aluminum foil backing is ideal as a vapor seal tape for duct closure.|Listed for both UL181A-P and UL181B-FX|Replaces mechanical fasteners for rigid duct board|Thermally conductive backing helps heating and cooling efficiency|Permanent acrylic adhesive combined with the durable 2.0 mil backing provides long service life