DDT, bend the tab over slightly so that the valve can close a bit more. If you are in a high wind area you might also want to consider a vacu-stack cap.I was considering taking my dremel to the air lever stop so that I can completely close it off if I wanted to. I do also live out in the country in the wide open, no wind blocks, always breezy
http://www.woodlanddirect.com/Chimn...ey-Caps/Vacu-Stack-Wind-Resistant-Chimney-Cap
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