A:Answer I don't know what they're talking about. Yes it has "curtains" that expand out to the sides, but I had to rig up something to go between the bottom of the unit and my vinyl windows so as not to crush the lip and the seal of the window. Never did get the tilt they recommend. And, because of the weight and concern about it damaging the double hung window, or falling, I've got the back end propped up with an old shovel handle.