We have purchased three 4 panel screens and I just ordered two 3 panel screens. We have tilt-turn windows in our house and the 4 panels can be made into Two 2 panels by removing the center hinges for our 28” windows and the one 4 panel works great for our 58” atrium door in our walk out basement. We have two offices with 48” windows the 3 panel screens are perfect for. With tilt-turn window one is usually forced to attach a shade to the window and secure the shade at the bottom of the window so the shade does not hang down when the window is in the tilt open position.