These 26-gauge 304 Stainless Steel wind resistant chimney caps are an economical option to prevent downdrafts. They come in many sizes and with options to fit most applications.
Round version suitable for chimney liners and sealed-end factory built chimney (like Duratech & Metalbestos).
Models available for "Air-Cooled" fabricated chimneys (like Duraplus).
Rectangle adaptor for masonry chimneys.
Bird guards available.
Vacu-Stack Chimney Caps come with a lifetime warranty.