A hopper window is a small window that opens downward and inward. It is commonly installed as a bathroom or basement window. The upward tilt of the window glass pane blocks open dirt and debris from getting into your home. It usually can be opened with a crank or hinge, A hopper window opens at the bottom and swings into the room. It is usually used above doors or high on a wall for extra light and ventilation. It can also be used as an egress window as it can swing open freely but must meet code requirements. However, exiting through a hopper window would require crawling over the pane of glass to escape.