Vacu-Stack® for Air Cooled Chimney
This is the premier chimney cap for solving common, wind-related draft problems. These problems often occur for homes that have hills, mountains, tall trees or buildings in the vicinity.
How it works: When wind flows around the Vacu-Stack's unique design, wind speeds increase which creates a partial vacuum. This vacuum then pulls flue gases up and out of the chimney, thus preventing wind-induced downdraft and the resulting infiltration of smoke, odor, and flue gas into your home. 
This cap also functions as a conventional chimney cap by protecting the chimney from rain, snow, debris, and animals. This Vacu-Stack® is specifically designed for round chimneys that are air insulated (also called air- cooled). 

All the Vacu-Stack® adapters are made of durable 304 Stainless Steel.

Information
Installation Instructions
Selection and Sizing Guide