Aluminum Foil Tape 3340 For HVAC Duct Sealing And Patching 3M Silver 2.5 Inch By 50 Yard 4 Mil Vapor Seal Tape That Sticks Like Crazy For Hot And Cold Ducts Fiberglass Duct Board Insulation And Metal Repair

Aluminum HVAC Foil Tape for Duct Sealing 2.5in x 50yd
✔️ 2.0 mil foil backing, acrylic adhesive, -40F to 300F, UL181A-P, 1 roll

This aluminum foil tape is a high-strength vapor seal designed for HVAC duct sealing and patching. It’s used on reinforced fiberglass duct board, rigid fiberglass duct, flexible air ducts, and metal surfaces to create durable, leak-free joints in both residential and commercial HVAC systems.

✅ 2.0 mil aluminum foil backing with 4.0 mil total thickness
✅ Pressure-sensitive acrylic adhesive for a strong, lasting bond
✅ Temperature tolerance -40°F to 300°F (-40°C to 149°C)
✅ Moisture, dust, and chemical barrier for long-lasting performance
✅ Easy release liner protects adhesive during handling
✅ UL181A-P and UL181B-FX listings verify reliability
✅ Suitable for duct closures on fiberglass, duct board, and metal ducts

💡 What is HVAC aluminum foil tape used for and how does it seal ducts effectively?

This handy, general explanation helps you decide if this tape fits your needs:

- Provides vapor seal for duct closures and joints - Withstands temperatures from -40°F to 300°F for hot and cold ducts - Resists moisture, dust, and chemical exposure for long-lasting performance - UL181A-P/UL181B-FX listings validate reliability in HVAC installs