Energy Star and BPI (as of 1/1/13) now are requiring HVAC contractors, Home performance contractors and HERS raters to use the new ventilation standard.

62.2.10 just makes sense, it adds an infiltration credit and window credits to whole house ventilation. So, if the home will be built loose, than no additional penalty added.

The Calculation is not near as simple as the depreciated ASHRAE standard. There are 3 components to the calculation;

Fan CFM = { [0.01Afloor + 7.5(## of Occ)]+(Alternative Compliance Supplement)} – Infiltration Credit

By Glenn Hooper February 4, 2015