A casement window hinges at the side and opens outward to the left or right. They are also known as crank windows, since they are opened with a handle that cranks
the supporting arm of the window outward. Our casement windows open and close with ease due to their easy-turn, fold-down handle. A rail is the horizontal piece of a window sash
– comprised of the lower rail, the check rail and the upper rail. Lower Rail. The lower rail is the lower part of the lower sash. Upper Rail. The upper rail is the top part of the upper sash.