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Windows come in many sizes, shapes, and styles. With so many varieties available, it might be confusing as to which type to install. The following definitions may help you see it more clearly.

Awning window: A unit in which the bottom of the sash swings outward.

Bay window: A combination of three windows, usually made up of a large center unit and two flanking units at 30 or 45 degree angles to the wall.

Bow window: A combination of four or more window units in a radial or bow formation.

Casement window: A window unit in which the single sash cranks outward.

Circlehead window: A generic term referring to any of a variety of window units with one or more curved frame members, often used over another window or door opening.

Cottage double hung: A double hung window in which the upper sash is shorter than the lower sash.

Double hung: A vertically operable window in which both sash operate.

French doors: Doors, which are primarily windows, but have wide panel members around the glass.

Louver: A window made of slats of glass that overlap when closed.

Roof window: Openable window installed in the roof within easy reach.

Single hung: A double-hung window with the top sash fixed or inoperable.

Skylight: A fixed or ventilating window in the roof, which cannot be reached directly. Includes systems that refract light to the inside through tubes.

Source: Crowns News & Views Spring 1998 Newsletter by RT Inc.

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