Hopper windows are also called basement windows, they are very energy efficient; as well as attractive, innovative and maintenance free. These types of windows are opened by means of hinges rather than sliding or lifting.
Hopper windows are hinged at the bottom and open inward. Screens are placed on the outside of the window. Hopper windows are also similar to casement windows, as the entire window area can be completely opened.
Hopper Window From Inside
Hopper Window From Outside