In response to concerns raised by Raters and Providers, Proposed Addendum 39 revises the MINHERS® Chapter 3 adoption of Standard ANSI/RESNET/ICC 301-2014 to allow a pathway for HERS® ratings to be completed where mechanical ventilation airflows cannot be measured, by evaluating the air exchange rate of the home in the same manner as a home without a mechanical ventilation system. In addition, it also provides default ventilation fan wattage where wattage cannot be otherwise determined. The addendum will take effect for RESNET HERS® ratings when adopted and serve until the next edition of Standard ANSI/RESNET/ICC 301 is adopted, which contains similar requirements. The first draft, PDS-01, of proposed Addendum 39 is submitted for public comment. To view the draft addendum, access the comment form, and view comments submitted to date, click on the links below. DRAFT PDS-01 OF PROPOSED ADDENDUM 39: NON-MEASURED MECHANICAL VENTILATION AIRFLOW AND DEFAULT FAN WATTAGE Comment on Draft PDS-01, MINHERS® Addendum 39 View comments on Draft PDS-01, MINHERS® Addendum 39 Comments will be accepted on all underlined red text in draft PDS-01. The public comment period will be open for 30 days beginning September 26, 2018 through October 25, 2018. After the comment period, RESNET Standard Development Committee 300 will consider and document each of the comments submitted and make appropriate changes. Any substantive changes to draft PDS-01 will be provided to the public for comment. When there are no more substantive changes the proposed final amendment will be submitted to the RESNET Standard Management Board for final approval.