Awning windows open outward from the bottom to enable ventilation. Screens are on the inside of the window, where they're more protected from the elements. Awning windows are often used for basements because they can be placed high on the wall and operate with a turn of the handle. They are a great choice to pair with non-operable windows, such as picture windows, since awning windows are generally smaller in size than double hungs, casements or sliders.