I had this complaint again from customer today. This is what I found and it fixed the problem.
Look into the return area of you A/C and you will notice where the wires come into the area. Sometimes there are fairly large hole. The A/C is also pulling air in from this area between your ceiling & roof. Take some metal A/C tape or Silicone and seal all the holes.
Sometimes you can get Sewer fumes back into the roof area if you plumbing is not venting properly or you have a large hole cut than needed for your plumbing vent pipe to come through roof. Take the plumbing vent cap off, take some dicor and seal off around where the pipe comes through the roof.
Hope this helps someone!!
Look into the return area of you A/C and you will notice where the wires come into the area. Sometimes there are fairly large hole. The A/C is also pulling air in from this area between your ceiling & roof. Take some metal A/C tape or Silicone and seal all the holes.
Sometimes you can get Sewer fumes back into the roof area if you plumbing is not venting properly or you have a large hole cut than needed for your plumbing vent pipe to come through roof. Take the plumbing vent cap off, take some dicor and seal off around where the pipe comes through the roof.
Hope this helps someone!!
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