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Generally speaking, windows are either fixed or operable. Fixed windows are used to allow light into a room and to draw attention to outside views. A few examples would be: round-top, large picture windows, triangular and other unusually-shaped windows. Operable windows are used where ventilation is important. Operable windows may slide up, down or sideways and may hinge outward or inward. The windows shown or listed below represent most major types.
Double-hung window, classic in appearance, offers excellent control of ventilation. You can raise the lower sash or lower the upper one. A single-hung window is similar but only the lower sash opens.

Casement window
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Casement window is hinged on one side and swings out when you turn a crank (some are inward-swinging). Because it opens fully, it affords good ventilation and is easy to clean.
The bay window, made from a central sash and two angled side sashes, is a classic favorite for expanding a room with light, views and drama. Angled side windows are often operable casements or double-hung windows.
Glass block is a light-allowing alternative to conventional windows, used both in exterior and interior walls. Various patterns allow varying degrees of view or privacy. Typical sizes are 6, 8 and 12-inch squares and 4 by 8 and 6 by 8 rectangles made for 4-inch-thick walls.
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Slider offers a contemporary appearance. It's made from two separate sashes-one is fixed, the other slides in a track. Half opens for ventilation. A slider is easy to operate and most types are particularly weather-tight.
Hopper window hinges at the bottom. A hopper is normally used for ventilation above a door or window, where protected by eaves.
The tilt-turn is a fairly new type of window. It tilts out for ventilation but also can be opened fully for cleaning or as an emergency escape.
Round-top and other geometrically-shaped windows are used as architectural accents.
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Slider Window
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Single hung window
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Awning window hinges at the top and tilts out at the bottom, providing partial ventilation. These are often used above doors or other windows.
A bow window is made from several windows positioned side-by-side to create an arcing form. Similar to a bay window, it provides drama in a room.
A seamless bent-glass corner window is a fairly new product that offers unobstructed views at the corner of a house.
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