NAFS Calculator

Cascadia Windows and Doors has developed the first North American Fenestration Standard (NAFS) calculator tool, now freely available to architects and other users. NAFS 2008, which replaces the previous CSA A-440 standard, is the newly-referenced standard for the physical performance and testing requirements of windows, door and skylights. It already applies to Part 3 of the BC Building Code and comes into effect for Part 9 on December 20,, 2013, The new standard requires users to calculate the necessary performance grade and water test pressure of windows and doors based on several tables of values provided in the standard (including location, wind speed, building height and exposure). Cascadia’s NAFS calculator, the first of its kind, helps with this important but difficult calculation, requiring only three user inputs. You can find it online at

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