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Types of Windows
Horizontal slider windows
These work well at sealing in energy. They may have one or more fixed panels in addition to one or more panels that slide in horizontal tracks. Only half of the total window may be opened for ventilation at a time.

Bay windows
This style projects out from the wall; a center window parallel to the wall is flanked by two windows attached at an angle, usually casement or double-hung styles. Box bays have side windows at a 90-degree angle.

Bow windows
A bow window projects like a bay but has more than three sections that join to form a gentle curve. Center windows are generally fixed; side sashes are typically casement windows.

Double-hung windows
Classic in style, double-hung windows have an upper outside sash that slides down and a lower inside sash that slides up.

Hidden springs, weights, or friction devices help lift, lower, and position the sash. With certain types, the sash can be removed, rotated, or tilted for cleaning.

If only one sash slides, the window is called "vertical sliding" or "single-hung." 

casement window crank PellaCasement windows
 Hung singly or in pairs, casement windows are side-mounted on hinges and operated by cranks that swing the sash inward or, more commonly, outward. They open fully for easy cleaning and offer excellent ventilation because they can "scoop" in breezes. 

Awning and hopper windows
An awning window is like a horizontal, top-hinged casement--it tilts out at the bottom, offering partial ventilation, an unobstructed view, and reasonably good security. A top-opening style, typically placed low on a wall, is called a hopper window.

Jalousie windows
Jalousie windows, also called louvers, are made of glass slats set in metal clips that can be opened and closed in unison. These offer good ventilation but are chilly and drafty in cold climates.

Tilt-turn windows
Tilt-turn windows offer distinctive European styling and have a special advantage over conventional double-hung windows: They tilt in toward the room at the top and also turn a full 180 degrees for easy cleaning. This feature also makes them excellent emergency exits. Look for a multipoint locking system; this adds security and helps keep the window tightly closed.


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Copyright Sunset Publishing Corporation
Photography courtesy of Pella


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