Differences in Design Pressure and Performance Grade

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Door& to Some BasicsDifferences in Design Pressure and Performance GradeB Y K E N B R E N D E NFenestration products areundeniably becoming morecomplex as performanceexpectations diversify and same is true of the standardsthat guide those who Design andspecify these products. The lynch-pin of these standards is theAAMA/WDMA/CSA 101 , The north AmericanFenestration Standard/Specification[NAFS] for Windows, Doors andSkylights, the latest version ofwhich is 2008 although the 2011version is waiting in the wings foradoption into the 2012 is apparent widespreadmisuse of certain NAFS perform-ance terms within the industry,especially Design Pressure per-formance class and performancegrade. At times, marketplace con-fusion has led to specifying thewrong product for a given build-ing application.

A440, The North American Fenestration Standard/Specification [NAFS] for Windows, Doors and Skylights, the latest version of which is 2008 – although the 2011 version is waiting in the wings for adoption into the 2012 I-codes. There is apparent widespread misuse of certain NAFS perform - ance terms within the industry, especially design ...

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