all sewer lines have traps, look under your sink, see the "S" in the drain? That's so no AIR can come back into your house. Once your exhause has hit the sewer line, you should not have to worry about smell coming back with the exception of the place you are tapped into. ....and if that's in your grow room, you have it confined!

SN
SpaceNeedle Reviewed by SpaceNeedle on . Venting into sewer line... I've been searching the forums for some info on whether anybody has ever Tee'd directly into a main sewer line before. I live in a rural area and have my own septic system. I know gas's rise but after they've travelled through those shit lines and up through the holding tanks, would that not change the smell considerably? Or would it JUST be changing where the odor come's out, as by the septic field? I read one thread whereby the fellow was going to vent up through his bathroom vent on the Rating: 5