--- In [EMAIL PROTECTED], "kirk" <[EMAIL PROTECTED]> wrote: > I find on very windy days my 20 foot long pipe is marginal unless the fire > is hot. > I need that much lift to offset the partial pressure made by the wind. > I haven't made any effort to capture the heat moving out the stack. > Those thermoelectric semiconductors they are touting look interesting. > They never seem to make it to market though. > > Kirk It sounds like you have a chimney and/or building problem. On the next windy day, try opening a window or door slightly on the upwind side of thee building. I'm speculating that the windward side of your building is fairly airtight compared to the downwind side, and the wind is causing a negative pressure from the downwind side, creating a pressure differential the chimney is trying to correct. Either seal up airleaks on the downwind side, or provide an inlet on the upwind side. Hope this helps, Motie
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