This window with loops is fixed in the end of the hole and attached by a metal clamp from the side of the end, the opposite to the one that it should close. Then the smaller of the panels is attached to the side frame, and the large panel is installed in its place along the entire screen. We need to make sure that the whole structure is stable and straight angles are everywhere designed correctly. And after that you can screw the panel on the frame. It is clear that before the commission of all these procedures, it is advisable to carry out all the necessary work with pipes and drain.