Hi!

I am trying to figure out how I would go about installing a stacking washer and dryer in a closet. The dryer would be a ventless dryer (which requires a drain) because I have no dryer vent and installing one would require going through 2 walls.

There is already a supply box for the washer (supply hoses and properly trapped and vented drain). I don't think the washer and dryer can share the drain in the box though (it is a tight fit and 1.5inch in diameter). However, whoever remodeled the house before installed a 2 inch ABS drain pipe sticking out of the wall horizontally (no trap, but I believe it shares venting with the washer drain).

I managed to get a 45 degree elbow and a vertical piece of ABS pipe installed to that. Pic here: [imgur.com]

I know that it now needs a trap, but before I go any further I wanted to ask about feasibility.

My next idea is to install another 45 degree elbow, a horizontal piece of ABS pipe for a "trap arm" (since it is 2in pipe this has to be at least 4 inches long?), a P trap, and then a vertical pipe on that for the dryer to drain into. A rough sketch (please excuse my paint skills): [imgur.com]


Since the dryer would be sitting on top of the washer the whole thing needs to be a total of 70 inches or taller (Washer height plus minimum standpipe height of 30 inches).

Will this work at all or should I give up?

Thanks!!