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The 3M&#8482; 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. Features:<ul style="margin-top:0px;padding-top: 5px; padding-bottom: 5px;"><li>2.0 mil aluminum foil backing is ideal as a vapor seal tape for duct closure</li><li>Listed for both UL181A-P and UL181B-FX</li><li>Replaces mechanical fasteners for rigid duct board</li><li>Thermally conductive backing helps heating and cooling efficiency</li><li>Permanent acrylic adhesive combined with the durable 2.0 mil backing provides long service life</li></ul>

3M&#8482; Aluminum Foil Tape 3340 Silver, 2-1/2&quot; x 150', 4 Mil - Pkg Qty 9

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