Forced Entry Resistance:

The forced entry resistance test for a fixed window evaluates the window’s ability to deter unauthorized access by resisting physical attacks at vulnerable points such as glazing stops, frame joints, or anchoring locations. Although fixed windows are non-operable, the test—conducted in accordance with ASTM F588 when specified—simulates an attempt to dislodge or breach the glazing using tools like pry bars or levers. The goal is to prevent a defined access probe from penetrating the window assembly within a set time frame. To pass, the fixed window must remain intact and resist being compromised, providing a level of passive security consistent with the requirements of its NAFS performance class.

Sash/Leaf Torsion:

A sash or leaf torsion test is not applicable to fixed windows, as these products have no operable sash or hinged components capable of independent movement. Fixed windows consist of a stationary glazed unit secured within a rigid frame, and therefore do not experience the types of twisting or racking forces that operable sashes are subjected to during opening or closing. Since there are no moving parts to flex or distort under torsional loading, NAFS does not require or define a torsion test for fixed window assemblies. Instead, structural performance for fixed windows is evaluated through tests like uniform load deflection, structural load testing, and glazing retention.

Life Cycle Testing:​​

The life cycle test for a fixed window with an operable section evaluates the durability and performance of the operable component—such as an awning, hopper, or projected sash—when subjected to repeated opening and closing cycles. Conducted in accordance with NAFS and AAMA 910 (for AW-class products), the operable sash is mechanically cycled through its full range of motion, including latching and unlatching, typically for 4,000 cycles or more depending on performance class. This simulates years of typical use and helps identify potential issues like hardware fatigue, seal compression loss, or frame misalignment. To comply with NAFS, the operable section must remain functional, structurally sound, and capable of meeting other performance criteria—such as air and water resistance—after the cycling is complete.