12-30-2005, 05:42 AM
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Deity
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Join Date: Jul 2004
Location: Saint Regis Falls, NY, USA.
Posts: 4,029
Thanks: 0
Thanked 3 Times in 3 Posts
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I have seen an electrically driven flapper in the flue pipe right where it enters the chimney. When the stack temperature reaches a set point the flapper opens and the super hot gases go up the chimney producing a positive draft. Check home depot.
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