Window blind awnings can also be closed or open sided, and come in various colors. A window blind awning’s standard projection is normally about half of the window’s size. Take for instance a 48-inch high window will hold an awning projection of approximately twenty-four inches; the measurements can differ depending on one’s need. Window blind awnings should be mounted on exterior walls or window frames; this is required to hold the window awning on level, sturdily, and well fitted.