Under zee door
And in camping position. It slides on a couple of wooden slides. Goes out very smoothly and easily. I bolted on a couple of pieces of aluminum L stock to each side and used the bracket that came with the unit on the top to keep it from falling through the door. The weatherstripping is applied to these brackets. I have a sort of lever system using a couple of bars vertically pressing against the side brackets from the inside to provide compression force for a good seal. It works very well. I will post some pics of these brackets and the levers when I take the AC out to paint the camper. The door becomes an awning and weather protector. When traveling the AC goes back inside and sits in the position of the second pic. There are wooden stops that keep it from going any further and from falling out on the floor when the road is bumpy.