Window Glossary

Window used over the top of a door or window, primarily for additional light and aesthetic value.

Glass heat-treated to withstand greater than normal forces on is surface. When it breaks, it shatters into small pieces to reduce hazard.

A single- or double- hung window whose operable sash can be tilted into a room to allow cleaning of the exterior surface on the inside.

Use of three panes of glass or plastic with two airspaces between. Generally refers to a sealed insulating unit.

Traditional window construction incorporating smaller panes of glass actually separated by muntins, rather than simulating such an appearance with larger lites of glass and a muntin grid or grille placed between or on the surfaces of the glass layers.