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Had same problem this winter, heat man installed vent in plentium to blow on drain pipe. Installed T joint above drain end so if freeze occurs it would drain in crawl space.seems to have worked well !!Open or close vent as needed.


Condensing furnaces are designed to be installed ONLY IN A CONDITIONED SPACE. Whoever installed one in an attic might need to get qualified to do heating work. Get the specific manual for the unit and see if there was something special that was supposed to be done to allow for that unit to be installed where it was subject to freezing temps. Again, the ...

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