Thermwell V25BK D-section Weather Strip Black 17 Ft

Product Description

The THERMWELL V25BK is a D-section, self-adhesive weather strip made from 100% cellular rubber. It measures 0.375 inches wide by 0.25 inches high by 17 feet long and comes in black. The cellular rubber construction allows this strip to remain flexible down to -40 degrees F, resisting hardening, cracking, and freezing even under prolonged subfreezing exposure. High-compression memory means the strip springs back to its original profile after sustained compression. HVAC technicians, contractors, and skilled trades professionals install this type of weather strip to seal air and moisture infiltration around doors, windows, access panels, and equipment enclosures.

This weather strip is suited for residential and light commercial applications where a reliable perimeter seal is required against cold air and moisture intrusion. The self-adhesive backing simplifies installation on clean, dry surfaces without requiring additional fasteners. The D-section profile compresses evenly against irregular or slightly uneven mating surfaces, making it a common choice for door frames, HVAC cabinet seams, and utility access panels exposed to cold-climate conditions.

Key Features

• Remains flexible to -40 degrees F — no hardening, cracking, or freezing at subfreezing temperatures
• 100% cellular rubber construction with high-compression spring-back memory
• D-section profile for even compression against door frames and panel edges
• Self-adhesive backing for tool-free installation on clean, dry surfaces
• Provides a continuous seal against air and moisture infiltration
• Black finish blends with standard door and panel trim

Compatibility

Designed as an OEM-style replacement or general-use weather strip for residential and commercial door frames, access panels, HVAC equipment cabinets, and similar perimeter sealing applications requiring cold-weather performance.

Installation Notes

Installation is typically performed by HVAC technicians, general contractors, or skilled trades professionals. Before applying, ensure the mating surface is clean, dry, and free of dust, grease, and old adhesive residue for maximum bond strength. Measure and cut the strip to length before removing the adhesive liner, and apply firm, even pressure along the full length after placement. Power down or de-energize any equipment before accessing sealed panels or enclosures.