A hopper window is a single-styled unit that is hinged on the bottom to open inwards. Its opening direction provides good ventilation and makes cleaning easier. They are best suited for bathrooms and basements where it is necessary to maintain ventilation at its maximum. But it has to be considered that when open, a hopper window can allow water or moisture to enter the rooms.
When closed, a hopper develops three seals that are responsible for maintaining comfort inside. It has a lever-style handle to open and close the sashes as per the need.
The fact that makes a hopper window more superior than others is its ability to accommodate the entire window screen. Unlike a casement, it opens inward against the screen. However, this window type is difficult to cover with blinds. Tinting or blinds/shades may be a solution.