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The 3M 7010337393 is a 2.0 mil aluminum foil tape coated with a heavy-deposition mastic adhesive, sold under the Venture Tape 1580-P product line. It carries a UL181B-FX listing, making it an approved sealing tape for flexible duct connections in HVAC systems. The foil backing provides a durable, low-permeance barrier, while the mastic adhesive delivers a water-resistant bond that holds on sheet metal, flex duct, and rigid fiberglass duct board. HVAC technicians and sheet metal installers use this tape where building codes and equipment manufacturers require a UL-listed closure for flexible air duct systems.
This tape is suited for residential and light commercial HVAC duct sealing applications. It is applied to longitudinal seams, spiral seams, and connections on Class 1 flexible air ducts and Class 1 flexible air connectors. The UL181B-FX listing satisfies inspection requirements in jurisdictions enforcing the International Mechanical Code and SMACNA duct construction standards. Each roll is 2 inches wide and 33.33 yards long, providing continuous coverage on duct joints without frequent splicing.
Designed for use on UL 181 Class 1 flexible air ducts and flexible air connectors as an FX-rated pressure-sensitive tape closure. Suitable for sealing connections on sheet metal, rigid fiberglass duct board, and factory-made flexible duct assemblies in HVAC systems.
Installation should be performed by a licensed HVAC technician or sheet metal mechanic in accordance with the International Mechanical Code and the duct system manufacturer's listing requirements. Power down the air handling unit and verify zero duct pressure before applying tape to seams. Clean all surfaces of dust, oil, and moisture prior to application to ensure full adhesive contact. Do not stretch the tape during application, as distortion can compromise the seal at the foil-to-adhesive interface.
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