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NW Washington | The coaxial exhaust and intake vents are fairly common for the High Efficiency furnaces. However, I had a furnace with pvc vents that went up the old chimney and never had a problem in weather as low a -22F, on this lash up the exhaust went straight up and the lower intake pipe had double elbows on it so it pointed down to keep rain from getting into it. Those furnaces produce a lot of water so the exhaust is very damp. The condensate pump on mine quite once and I had a real mess of water that smelled like vinegar in the basement. I would guess that the best fix would be to use the pipe in a pipe arrangement. Next get the intake about a foot below the exhaust.
Edited by JohnW 2/6/2009 02:40
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High efficiency gas furnance: Intake freezes shut
