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Just Bill's Avatar
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Join Date: Oct 2006
Posts: 4,219
DE

12-15-08, 03:16 PM   #2 (permalink)  
You have warm moist air drifting out of the vent and SUPER cold temps outside, sounds like perfect icing conditions to me. We do not have that problem here, but I would suspect the north dwellers often do. Perhaps heating tape wrapped around the vent or something similar????