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

Scotch Foil Tape 3326 is especially designed for use on UL listed flexible and rigid air ducts. Its specially formulated acrylic adhesive bonds quickly and holds even at -25oF. Its soft aluminum handles and applies easily but still provides strength for UL 181A and ULB-FX compliance. The printed backing provides code compliance verification for building inspectors.

• Soft aluminum applies easily
• Can be used under all weather conditions
• Resists water vapor, odor and smoke transmission
• Adhesive is protected until the liner is removed
• For UL 181A and ULB-FX compliant
• Printed backing provides code compliance verification for building inspectors
• Color: silver
• Contains: 1-roll/pack
• Size: 2.5 in. x 60 yd.