A hopper window is hinged on the bottom and tilts open at the top so the entire window can be opened. It has a crank handle and a mechanism that holds the window in place, preventing it from slamming shut in the wind. The window screen attaches on the outside. People usually confuse awning windows with hopper windows. When either a hopper or awning window is positioned over a door, it is called a transom window.
Hopper windows are typically used in areas that require small openings, like basements and bathrooms, that also need as much ventilation as possible, for which a hopper window is ideally suited since, unlike windows that slide, it opens completely and requires a limited amount of space. The hopper window accommodates a full window screen because the window opens inward, away from the screen.
A hopper window is more effective at preventing air leakage than other standard window types because the sash presses against the frame when it is closed. These windows seal more tightly than is possible for the sliding seals in traditional windows, keeping heat or air conditioning in and the elements, out. Windows with compression seals allow about half as much air leakage as double-hung windows and horizontal sliding windows with sliding seals.
Benefits
• Because it opens outward at an angle, it helps prevent debris like leaves and paper from blowing into your basement
• Hinged design provides maximum ventilation in a minimal space
• Energy efficient because of the tight seal
• Easy to open because you only have to be able to reach the handle and not the entire window
• Since the corners of the window are on the top, there is no danger of accidentally banging your head
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