A bay window is generally made up of three windows. The side or flanker units project out from the building at 30, 45, or 90 degree angles. The center is parallel with the building wall and is made up of one or more joined windows. All of the units can be stationary, operating, or any combination of the two. Typically the center section is stationary, while the side units are operating for ventilation.
Add space: The protruding shape adds space to the room.
Add value: The attractive look of a bay window adds space and improves the natural light.
Ventilation and lighting: The movable sashes allow for good ventilation and the shape of the window allows more natural light to enter your home.