We have two of them, really a nice addition. I can't speak for all the models,but ours;
Remote control, you can open, close, adjust speed, and/or reverse the flow. Really nice at night to blow cool are into the bedroom.
Set it to open and start at a pre-set temperature in the RV.
Closes automatically if it starts to rain.
Moves a LOT of air, set one to blow in, the other to blow out.
One drawback is that it will pull sever gas smell into the RV if you don't have a window(s) open OR one fan to blow air in, while the other exhausts air out.
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