Have been searching the net for a small fan that would fit inside the "standard" 20X52 MH, 5 ver, rv rig window frame. We don't need a roaring fan,just something to move some air. 07 HR ambassador ...
I bought a small unit at Target of all places that has two fans side by side and is only about 8" high by about 20" wide. And it has flexible side wings to adjust the width wider. It can mount horizontal or vertical and has high/low speeds. You can flip it for exhaust or intake. I use it to draw in cool air faster while the ceiling fan is on exhaust.