Hey FlyGuyOU!!! :thumbsup:

From what I am reading you are talking about your washers standpipe.
The problem I see is, there is no seal at the top where the washer hose is dropped into it. This is a Vacuum break so when your washer drains it does not syphon all the water out of the washer.

A Y connection is possable but I dont believe it will help vent air out of the grow without venting it into the laundry room. There is a P trap at the bottom of that pipe that is full of water. The smell will go back into the laundry room before it blows through the water in the P trap.

A solution would be to seal the pipe where the washer hose drops in, and add a syphon break to the washer hose. You will need a good blower to blow through the standing water in the trap.

This is only a 2" pipe, you would be better off hooking into the main line, probably a 4". If you do this you will need to be sure you will get no backflow through your room vent.

I hope this gives you some insight into your problem.

Oh Yeah, I'm a Carpenter not a Plumber, check your local building codes.
GOOD LUCK
:hippy:
Dreadscale Reviewed by Dreadscale on . Question about venting down drain So i was looking around and had read about how people vent their exhaust down the sewer and that sounded like a really interesting idea. does anyone have any experience?? from what i read is you find the main line into the sewer found in peoples basements. However where I'm living we have no basements (tornado alley no less) so i was thinking about running through the drain pipes connected to my washing machine...what do you guys think? i'm going to do some snooping around my laundry room, b/c Rating: 5