Sewer Gas Smell In Basement and through AC Vents

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GCC99

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We have had a reoccurring (almost daily since mid-September) sewer gas smell through the AC vents in the house. A few days ago I dumped some water down the condensate line connected to the air handler. The smell went away for a week but then came back today. Is our condensate line set up the way it should be? Pictures are attached. I believe it drains into the sewer. Thanks in advance.
 

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Reach4

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I would stopper that open pipe. I guess you could adapt an AAV to it if you don't like a stopper.
 

Jeff H Young

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cant make heads or tails out of your pictures. but pretty much guarantee its wrong. it should dump into a trapped line .
 
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