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Old 01-14-2020, 07:22 AM
CrisPbacon CrisPbacon is offline
 
Join Date: Oct 2017
Posts: 81
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This seems to happen a lot in new home builds. I would say insult the intake pipe. If the intake and exhaust are close together, the warm exhaust is probably condensing to form vapor which is being sucked into the intake and then freezing, leading to frost formation.
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