A window sash is the moveable frame that holds the panes of glass in a window. Technically, any window containing this type of frame or glazing is called a sash window. However, the term is most commonly used for windows with sashes that open vertically, such as single- or double-hung windows. Sashes are typically separated by small bars called muntins and are held in place by stops, or small pieces of trim that keep the sashes from falling in or out of the window frame itself.
In double-hung windows, both the top and bottom sashes slide up or down independent of each other. In a single-hung window, only the bottom sash is movable. Historically, sash windows were made of wood and single-glazed (containing only one layer of glass). Newer single- and double-hung windows are also commonly made from vinyl, which is relatively inexpensive and not as susceptible to rot, swelling, or being painted shut.
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