Window Types

A window isn't just meant to bring light and views to a room. It may also define a room's shape, provide an architectural focal point, allow ventilation or provide for emergency escape. To serve widely varying needs, windows are made in a vast array of types and sizes that operate and function differently.

Broadly speaking, windows are either fixed or operable. Fixed windows are used mostly for accents or where light and views-but not ventilation-are important. Most round-top, triangular and other unusually-shaped windows are fixed, as are large picture windows.

Operable windows may slide up, down or sideways or they may hinge outward or inward. The windows shown represent most major types.

Contemporary windows are available in a number of innovative styles. You can buy a bent-glass corner window, curved-glass windows or casements with no center stile, for example. Some beautiful bow and bay windows, made-up by combining fixed and operable units, are also common.

The 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.

A 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.

A 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.

An awning window hinges at the top and tilts out at the bottom, providing partial ventilation. These are often used above doors or other windows.

Jalousie or "louvered" windows are excellent for ventilation but poor insulators-they leak a great deal of air.

A 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.

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