A horizontal component of a door or window. Both doors and windows are constructed using two primary parts, rails and stiles. The rails refer to the horizontal parts. The stiles refer to the vertical parts. The removable part of a window that holds the glass.
Some sash can open and shut.
Others are fixed or stationary. In a double-hung window unit, the sash slide up and down, thus opening and closing the window. In a casement window, the sash opens using a hinge mechanism, swinging either to the left or right. In a sliding window, or slider, the sash slides from one side of the window to the other. Single Hung A type of window with and operable bottom sash, and a fixed sash, or direct glazed light on the top.