The American Architectural Manufacturers Association (AAMA) has become widely recognized for developing voluntary standards to test and validate the performance and quality of windows, doors and skylights. The current AAMA/NWWDA 101/I.S.2 specification establishes stringent standard for the testing of windows in the following categories:

Design Pressure (DP): Resistance to wind and other dynamic pressures. The higher the DP rating of a window or door, the more resistant it will be to the effects of wind and other pressures. · Air Infiltration: Air Infiltration is the amount of air leaking through a window or door. The lower the air infiltration rating, the better. To pass, a window cannot exceed 0.3 CFM/Sq Ft of air infiltration with a 25 mph wind. · Water Resistance: The ability of a window to withstand leakage from a wind driven rain. Windows are rated on a pass/fail basis. · Forced Entry Resistance: A skilled/trained lab technician attempts to gain entry with common tools. A window must pass the forced entry resistance test to be certified to the AAMA/NWWDA 101/I.S.2 specification.