TDW 6 Inch Stainless Steel Vacu-Stack - For Double and Triple Wall

The TDW Vacu-Stack Is The Best Solution For Wind Induced Downdraft. Stops wind from blowing into the chimney. Prevents wind induced downdraft regardless of wind direction (even downward.) Accelerated air flow around the Vacu-Stack creates a venturi, causing flue gasses to flow up and out of the chimney. Note: For Air-Cooled Double and Triple Walled Chimneys. This model features separate passages for cooling air to flow uninterrupted through convection cooled chimneys. Features: 100% Stainless Steel Construction, Easy To Install, Self-adjusting Spring Fit, Wind Tunnel Tested, Tested To UL 103 Standard, Lifetime Limited Warranty.6'' Stainless Steel Vacu-Stack TDW (For Double and Triple Wall Air Cooled Chimneys)