In 2009, cmconrad99 wrote that he suspected that his newly installed E-Z breathe ventilation system migt be contributing to a backdraft problem that was bringing sewage odor into the house. If you happen to see this, cmconrad99, were you ever able to determine whether the E-Z Breathe really was a factor? I think I may have the same issue.
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are there any dry trap floor drains in the rooms where this is located?
No.
But there's probably a floor drain somewhere.
Yes. And there's water in it. And it's pretty far from where the odor is.
So
Where's the source of the stink?
and
if you shut off the EZ breathe, is the odor gone?
How about a rarely-used laundry sink?
Or is there a ventless drain with AAV somewhere?