On Sun, 10 Feb 2008 05:27:43 -0500, Lanny Henson wrote: >And I have over 400 cu ft so if the >exhaust from a stove rises and does not mix with the low lying combustion >air, it should work. Lanny you need to consider there is a large change in overall volume between input air + fuel and hot flue gases at atmospheric pressure. AJH