The Vacu-Stack Masonry Adapter allows you to mount a regular Vacu-Stack on a masonry flue. The quick and easy installation process begins by sealing the adapter to the top of the flue with silicone sealant. Next, turn the wing nut device that extends the ends of the threaded rod at the sides of the adapter until the ends of the rod are wedged at the corners of the flue. The Vacu-Stack itself then simply fits into the round portion of the adapter. The Vacu-Stack Masonry Adapter measures 7" Diameter, and will cover a chimney liner up to 10" x 14".

• The Vacu-Stack Masonry Adapter measures 7" Diameter, and will cover a chimney liner up to 10" x 14".
• Meets UL standards
• 304 Stainless steel construction
• Wind tunnel tested

The Vacu-Stack Masonry Adapter measures 7" Diameter, and will cover a chimney liner up to 10" x 14".