Home >Articles >RESNET Proposes Amendment to ANSI/RESNET/ICC Standard 301 to Replace Equation for Total Air Exchange Rate

RESNET Proposes Amendment to ANSI/RESNET/ICC Standard 301 to Replace Equation for Total Air Exchange Rate

Jun 30, 2016

Currently the ANSI/RESNET/ICC Standard 301 refers to the ASHRAE Standard 62.2-2013 for calculating the total air exchange rate for homes.  A number of HERS Raters, home builders and Joseph Lstiburek have expressed concern that the current standard provides excess ventilation

The RESNET Standard Committee 300 has approved submitting the proposed amendment BSR/RESNET/ICC 301-2014 Addendum C-201X, PDS-01, Whole-House Mechanical Ventilation to the RESNET consensus standard amendment public review and comment process.

The proposed amendment 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,
  • Remove reference to ASHRAE  Standard 62.2-2013 and replace with:
  • Combined infiltration and ventilation may not be greater than nL * wsf * 1.2 in summer and nL * wsf * 1.6 in winter.
  • Replace standards references to the RESNET Mortgage Industry National Home Energy Rating System with references to Standard ANSI/RESNET/ICC 380-2016 in related sections. RESNET has released for public review and comment the proposed substantive changes to RESNET’s instruction, assessment and certification standard.

The proposed amended language is posted at BSR/RESNET/ICC 301-2014 Addendum C-201X, PDS-01, Whole-House Mechanical Ventilation

Only the proposed changes (denoted in underline-strikeout format) are open to comment.

To submit your comments click on RESNET Amendment Comment Online Form.

Comments are posted real time and you will be able to review comments that were submitted by clicking on Comments Submitted on Proposed Amendments.

Comments will be accepted only on the changes to the previously published proposed amendment.

The public comment period is open from July 1, 2016 until July 31, 2016.

After the comment period, the RESNET Standard Development Committee 300 will consider and document each of the comments submitted and make appropriate changes. The revised proposed amendments then will be submitted to the RESNET Standard Management Board for adoption.