PERFORMANCE: Codes & Standards
Energy & Cost
Codes & Standards
North American Fenestration Standard
The North American Fenestration Standard/Specification for windows, doors and skylights (AAMA/WDMA/ CSA 101/I.S.2/A440) provides a method for rating the structural performance, water resistance and air leakage of fenestration products. Ratings determined in accordance with this standard can be used to show compliance with the air leakage requirements of building energy codes and with ASCE 7, the calculation method for wind loads in the International Building Code.
Under the 2008 version of this standard, windows can achieve one among four performance classes depending on the stringency of test conditions and the achieved ratings:
Depending on the performance class, qualifying products must meet minimum requirements for sample size and structural and water resistance test pressure, as well as additional test requirements. To qualify for any of the performance classes, most windows must have a tested air infiltration rate no higher than 0.3 CFM/ft2. AW class windows are tested at a higher pressure than R, LC and CW class windows.
The following organizations can provide more information on the North American Fenestration Standard: