Vacu-stack chimney cap?

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Hello, it's been awhile since last post on my back puffing wood stove. Thought I would share what finally fixed my issue. The vacu stack may have very slightly did some good but the real fix was putting styrofoam covers in foundation vents on back side of house, this stopped vacuum/wind blowing under house during high continuous wind gusts. Stove vents threw floor so vacuum was pulling air out of stove threw the vent. Wind blows at front of house then over roof and down the back of house, pulling air out of bottom of stove vea the stove fresh air vent. I know it sounds far fetched but all I can say is covering the foundation vents on back of house cured the problem 100 percent. Finally after 5 years no smoke in house. Hope this helps someone else.
 
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