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I will have to try the manometer experiment you suggested to see, thanks.

Thanks for all the tips guys. I did some testing today and have found a correlation with the air\smell with my ac\attic fan. In the morning, AC was off, attic fan was off, there was no smell and no air blowing out (that I could sense). Later, turned on the AC, attic fan still off, I could...

It is a fan in my attic that blows hot air out of the attic. The roof also has 4 air vents to try and replace this air. Looks like this from my attic https://upload.wikimedia.org/wikipedia/commons/thumb/3/36/Attic-fan-underneath-roof.jpg/220px-Attic-fan-underneath-roof.jpg Yea I probably...

Plumber did not see any holes in the pipe, but I wouldn't rule out the possibility of something being loose. My next step might be to open the drywall and investigate. I have to open up the drywall behind the bathroom to investigate. I doubt that the trap is in the wrong place because this was...

I can definitely feel the air coming out of the drain. When you say bad trap, what do you mean? Like cracked or something? It's holding water fine so I dont know what could be wrong with it.

Thanks for the reply. I poured bleach down last night and today there is no sewer smell! However, there is a bleach-y smell blowing out of the drain. The trap is still full of water, any idea on why there is air blowing out of the bathtub drain?

I am getting this terrible sewer gas smell coming from my bathtub drain. It is practically blowing out of my drain and fills up the house with terrible odor if I leave it uncovered for more than a few minutes. Generally, the smell is worse during the day than it is at night. The tub gets used...