Simply put, an awning window is a window that has a hinge at the top (header) of a window. This hinge allows the sash(moving portion of a window) to be pushed out usually 3 to 4 inches.
Ventilation/View preservation balance. In any frame situation the eye is automatically drawn to the center of an opening, picture or landscape. Therefore, when you look out a window, your eye is usually drawn to the center of the opening. Single hung windows and horizontal slider block the view with a center mullion going straight down the middle of your line of sight. This is a drawback to this type of window, so many people choose "fixed windows" or picture windows. The problem with this type of window is the loss of ventilation abilities.
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