AAMA: American Architectural Manufactures Association. A national trade association that establishes voluntary standards for the window and door industry.
Air Infiltration: The amount of air leaking in and out of a home through cracks in walls, windows and doors.
Aluminum-Clad Window: A window with wood construction covered with aluminum sheet that has a factory-applied finish.
Architrave: The molded frame or ornament surrounding a window, door or other square opening.
Argon Gas: An inert, nontoxic gas used in insulating glass units to reduce heat transfer.
ASTM: American Society for Testing and Materials. An organization that develops methods for testing of materials.
Astragal: An interior molding attached to one of a pair of doors, or side-hinged windows in order to prevent swing through, often on older casements. Can also be used with sliding doors to ensure a tighter fit where the doors meet.
Awning Window: A window hinged at the top, the sash swings outward from the bottom.