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Single Hung: A window that has one operating sash which operates vertically.
Double Hung: A window that has two operating sashes which operate vertically.
Awning: A venting style window whose sash is hinged at the top and when it is opened, the sash cranks out and up.
Hopper: A venting style window whose sash is hinged at the bottom and when it is opened, the sash cranks out and down.
Casement: A venting style window whose sash is hinged on the jamb and when it is opened, the sash cranks out and to the right or left.
Picture window: A window that is not operable. Also may be called a fixed window.
Slider: Window whose sash operates horizontally. One side is usually non-operable.
Bay: Bay windows are formed with three or more windows and have more defined angles than a bow window.
Bow: Bow windows are typically four or more windows and produce a gentle curve.