Differences in Design Pressure and Performance Grade

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.

unit skylights and tubular daylight devices. This is a test that assesses any permanent damage associated with the assembly; b) Water penetration resistance: The water penetration resistance test pressure, which simulates the force behind wind-driven rain, is generally is based on 15 percent of the design pressure for R, LC, and CW performance ...

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