This is a stacked washer/dryer in a 32" square laundry alcove I'm building. I currently have a 2x5 wall behind the dryer, so it can contain rigid 4" ductwork. I have a 90 degree bend with a flange that I can mount on that wall at just the right location to line up with vent outlet on the back of the dryer.
But then how do I actually install the dryer? The best idea I have had is to have a short length of rigid duct on the back sticking out, and carefully slide the dryer in so that the duct lines up with the port in the wall. That seems very difficult, though. Has anyone done anything like this?