Vacu-Stack Chimney Caps work great on masonry and class-A chimneys, but they are only designed to fit on class-A chimneys with solid-pack insulation. This model however is designed to fit on 6" inside diameter, double or triple-wall, air-insulated class-A chimneys or can be used with solid-pack pipe with the insulation exposed.
The Vacu-Stack cures most wind-related backpuffing problems.
The Vacu-Stack is made of 26-ga., 304-alloy stainless steel. To install, slide the Vacu-Stack into the pipe and seal with a bead of high temperature silicone sealant.
2 pcs. with adaptor included.
17" diameter bottom plate.
Free shipping within the continental US