AAMA: American Architectural Manufacturers Association. A national trade association that establishes voluntary standards for the window, door, storefront, curtain wall, and skylight industries.

Air Chambers: Spaces with the sash and frame which makes the window more energy efficient and help to insulate.

Air leakage: It is the measured, equivalent cubic feet of air passing through a square foot of window area. Heat loss and gain occur by infiltration through cracks in the window assembly.

Airspace: The space between multiple-pane of glass in a window.

Argon gas: Is safe, nontoxic, non-flammable inert gas used in insulating low e glass unit to reduce heat compounds.

ANSI. American National Standards Institute.

Annealed glass: Standard sheet of float glass which is a process of heating and slow cooling to relieve stresses either compressive or tensile in a matter of minutes.

Awning window:  is a window with one or more sashes, hinges at the top and swinging outward. Designed to admit air while excluding rain.