Thermwell VP57 Small Rectangle Vent Plug Basement Crawl Space

Product Description

The THERMWELL VP57 is a small rectangular vent plug designed to seal foundation vents in basements and crawl spaces. Measuring 5.5 inches by 7.75 inches, it blocks cold air and wind infiltration through open vent openings during colder months. The plug provides a tight, form-fitting seal that helps reduce heat loss and prevents drafts from entering the conditioned or semi-conditioned space below the structure. HVAC technicians, plumbers, and general contractors working in crawl space environments use this type of plug as part of seasonal weatherization and winterization service calls. Each package contains 8 units, making it practical for multi-vent installs in a single visit.

The VP57 is suited for residential applications where foundation vents are present in basements or crawl spaces. It is typically installed in the fall as part of a seasonal weatherization program and removed in the spring to restore ventilation. The rectangular profile is dimensioned to fit standard small foundation vent openings. No tools are required for basic installation, making it a fast add-on service item during routine winterization work.

Key Features

• Rectangular profile sized at 5.5 inches by 7.75 inches for standard small foundation vent openings
• Seals basement and crawl space vents against cold air and wind infiltration
• Packaged 8 units per pack for multi-vent residential jobs
• Designed for seasonal installation and removal without permanent fasteners

Compatibility

Designed as an OEM-style replacement and standard fit for small rectangular foundation vent openings commonly found in residential basement and crawl space construction.

Installation Notes

Installation is performed by HVAC technicians, weatherization contractors, or plumbers during seasonal crawl space service. No special tools are required for most installations. Ensure the vent frame surface is clean and dry before seating the plug to achieve a proper seal. Remove the plugs in spring to restore foundation ventilation and prevent moisture buildup.