Posted 2/5/2009 23:06 (#598455 - in reply to #598073) Subject: RE: High efficiency gas furnance: Intake freezes shut
Lac qui Parle County Minnesota
Dolittle is right on the reason. You have to add some pvc to your intake. Around here alot of them run a 45 degree elbow straight up, add another foot of pipe to that and top it off with another elbow. Its like he said, the warmer moist air is being sucked back into the intake and freezing on the much colder pipe.
High efficiency gas furnance: Intake freezes shut
