Thermwell L346 Foam Weather-strip Tape 3/4x1/2 in Charcoal

Product Description

The THERMWELL L346 is an open-cell foam weather-strip tape designed to seal gaps around doors, windows, and HVAC access panels. Measuring 3/4 inch wide by 1/2 inch thick and supplied in a 17-foot roll, it compresses flat under pressure to form a tight, resilient seal. The self-adhesive backing allows for fast, tool-free application on clean, dry surfaces. The charcoal color blends discreetly with dark frames and metal surfaces. HVAC technicians, plumbers, and general contractors use this tape to reduce air infiltration, dampen vibration, and provide a compressible gasket layer wherever a flexible foam seal is needed.

This weather-strip tape is suited for residential and light commercial applications. It is commonly applied to door and window frames, equipment access hatches, ductwork flanges, and pipe penetration points where a compressible foam gasket reduces drafts and minor vibration. The open-cell foam construction allows the material to conform to irregular surfaces while maintaining a continuous seal under sustained compression.

Key Features

• Self-adhesive backing for tool-free, peel-and-stick installation
• Open-cell foam compresses flat to fill irregular gaps and form a tight seal
• 3/4 inch width by 1/2 inch thickness accommodates moderate gap sizes
• 17-foot roll provides coverage for multiple door or window openings per roll
• Charcoal color suits dark frames, metal surfaces, and equipment panels

Compatibility

Designed as an OEM-style replacement and general-purpose foam weather-strip tape for residential and light commercial sealing applications on doors, windows, and HVAC equipment panels.

Installation Notes

Surface preparation is critical — clean and dry the substrate thoroughly before applying the adhesive backing, as dust, oil, or moisture will reduce bond strength. Cut the tape to length with a utility knife or scissors. Licensed HVAC technicians should power down associated equipment before applying tape near electrical or mechanical components. Do not stretch the tape during application, as this reduces the effective foam thickness and sealing performance.