Window Hardware
The window frame is the fixed non-operable border to a window designed to receive and hold sash window or casement window units. Window units are complete windows with sashes or casements ready for installation into a window frame. A sliding sash window moves horizontally in groves or runners, whereas a casement window is a ventilating sash that is fixed at the sides of the opening into which it is fitted, and swings open at the hinges.
