Sewer smell in heating vent
Posted by Greg Wilson on July 21, 2001 at 10:37:22:
Occassionally, we have a sewer smell coming from the heat vent in the upstairs bathroom. We only smell it when the furnace or A/C is on. The vent is about a foot from the toilet. I have checked the sewer vent on the roof and it does not have any obstructions. This bathroom has been used infrequently but there doesn't seem to be any relationship to it's use and the smell.

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