🛡️ Seal like a pro, last like a legend!
3M Aluminum Foil Tape 3340 is a 2.5" x 50 yd, 4.0 mil thick HVAC tape featuring a 2.0 mil aluminum foil backing with strong acrylic adhesive. It seals and patches hot and cold air ducts, fiberglass duct boards, and metal surfaces, operating reliably between -40°F and 300°F. Certified UL181A-P and UL181B-FX, it offers superior vapor sealing, moisture and chemical resistance, and easy application with a poly-coated kraft liner.
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