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

The amount of air leaking in and out of a building through cracks in walls, windows and doors.

An inert, nontoxic gas used in insulating glass units to reduce heat transfer.

American Society for Testing and Materials. Organization that develops methods for testing of materials.

A window that is hinged at the top and swings outward for ventilation.