The proposed Addendum C amends Standard ANSI/RESNET/ICC 301-2014 to: replace equation for total air exchange rate (infiltration plus fan forced) with equation for fan forced rate only.; add definitions related to the use of the equation, and; replace references to the RESNET Mortgage Industry National Home Energy Rating System standards with references to Standard ANSI/RESNET/ICC 380-2016 in related sections. Preliminary Draft Standard: PDS-01 Comment on this draft Standard View comments on this draft Standard RESNET will accept public comments on preliminary draft addendum BSR/RESNET/ICC 3012014 Addendum C-20xx, PDS-01, Whole-House Mechanical Ventilation, to Standard ANSI/RESNET/ICC 301-2014, Standard for the Calculation and Labeling of the Energy Performance of Low-rise Residential Buildings using an Energy Rating Index, January 15, 2016. Comments will only be accepted on the changes to Standard ANSI/RESNET/ICC 301-2014 indicated by strike/underline in the addendum. The public comment period will be open for 30 days from publishing of the notice in ANSI Standards Action, July 1, 2016, and close July 31, 2016.