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Vacu-Stack Stainless Steel Chimney Cap for Air Cooled Double & Triple Walled Metal Chimneys 10" The Vacu-Stack Chimney Cap prevents "wind induced downdraft" regardless of wind direction (even downward). Accelerated air flow around the Vacu-Stack creates a venturi causing flue gases to flow up and out of the chimney. These models are specifically designed for installation on double and triple walled air-cooled chimneys. These models feature seperate passages for cooling air to flow uninterupted through convection cooled chimneys. The best solution for Wind Induced Downdraft Stops wind from Blowing into the Chimney 100% Stainless Steel Construction Easy to install, Self-adjusting Spring Fit Lifetime Limited Warranty Wind Tunnel Tested Tested to UL 103 Standard
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