Window Glossary Air Chambers Air Infiltration Air Latch Angled Interior Argon Gas Astragal Awning Window Bay Window Beveled Exterior Bow Window Brickmold Cam Lock and Keeper Casement Window Casing Check Rail Circlehead Cladding Double-hung Window Fixed Window Flashing Frame French Sliding Door Glazing Glazing Bead Grille Insulating Glass Jamb Air Chambers Small honeycomb spaces within the sash and frame which help to insulate and strengthen the window Back to Top Air Infiltration The amount of air that passes between a window sash and frame. In windows it is measured in terms of cubic feet or air per minute, per square foot of area. The lower the number, the less air the window lets pass through. Back to Top Air Latch Latch mechanism on the interior face of the sash that retains the window in a partially open position for ventilation. Back to Top Angled Interior A sloped extension from the frame that adds an aesthetically-pleasing dimension to the exterior of the window. Back to Top Argon Gas Argon is a safe, odorless, colorless, non-toxic, non-flammable inert gas that is commonly used in place of air between the glass panes of an insulated Low-E glass unit to reduce temperature transfer. Back to Top Astragal The center member of a double door, which is attached to the fixed or inactive door panel. Back to Top Awning Window A window unit in which the bottom of the sash swings outward for ventilation. Back to Top Bay Window A composite of three windows, usually made up of a large center fixed unit and two flanking units at 30-,45- or 90- degree angles to the wall. Back to Top Beveled Exterior An angled extension from the frame that adds an aesthetically-pleasing dimension to the exterior of the window. Back to Top Bow Window A composite of four or more window units in a radial or bow formation. Back to Top Brickmold A type of external casing which frames windows and doors. Back to Top Cam Lock and Keeper The mechanisms which pull the sash together when placed in the locked position. Back to Top Casement Window A window unit in which the single sash cranks outward, to the right or left. Back to Top Casing Molding of various widths, thickness and shapes applied to the framework of window and door units. Back to Top Check Rail On a double-hung window, the bottom rail of the upper sash and the upper rail of the lower sash, where the lock is mounted. Back to Top Circlehead 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. Back to Top Cladding Any material locked to the outside faces of doors and windows to provide a durable, low-maintenance exterior surface. Back to Top Double-hung Window A window unit that has two operable sashes which move vertically in the frame. Back to Top Fixed Window Non-venting or non-operable window. Also known as picture window. Back to Top Flashing A thin strip of metal or synthetic material that diverts water away from a window or skylight. Back to Top Frame The enclosure in which window sash or door panels are mounted. Back to Top French Sliding Door A sliding door which has wider panel members around the glass, giving the appearance of a French hinged door. Back to Top Glazing Glass in a window or door; the act or process of fitting with glass. Back to Top Glazing Bead A plastic or wood strip applied to the window sash around the perimeter of the glass. Back to Top Grille A term referring to windowpane dividers or muntins, usually a type of assembly which may be detached for cleaning. Back to Top Insulating Glass A combination of two or more panes of glass with a hermetically sealed air space between the panes of glass. This space may or may not be filled with an inert gas, such as argon. Back to Top Jamb The main vertical members forming the sides of a window or door frame. Back to Top

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