The ICP Vacu-Stack Cap is a great, economical, lifetime warrantied alternative for preventing downdrafts.
If your chimney frequently experiences wind-related back-puffing, this cap could solve the problem. When the wind hits this cap it actually increase upward draft.
ROUND FLUES:
To attach the Vacu-Stack to relining pipe, just slide the base inside the pipe as far as possible and secure with screws.
For SOLID-PACK, class-A chimney with sealed ends, push the cap into the sealed end chimney until secure. Silicon the joint where the chimney and cap meet.
For air inslulated or (pipe within a pipe) type chimney use the AIR INSULATED CAPS. Note: To determine the size for all round flues simply measure the inside diameter of your chimney
SQUARE FLUES:
To use the Vacu-Stack chimney cap on a square masonry flue tile, you need the 304-alloy stainless steel Masonry Adaptor.
Just select the adaptor that matches the size of your vacu stack chimney cap.
RECTANGLE FLUES:
We carry 2 sizes and both include the adaptor that you will need
A pressure-fit device inside the adaptor secures it to the flue tile. Then you simply attach the Vacu-Stack cap to the adaptor.
The Vacu-Stack is made of heavy, 24-ga., 304-alloy stainless steel, and is avaliable in 3" - 10" diameters.
