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Draft PDS-01, BSR/RESNET/ICC 380-202x

Proposed Standard BSR/RESNET/ICC 380-202x will be the 3rd edition of Standard ANSI/RESNET/ICC 380, Standard for Testing Airtightness of Building, Dwelling Unit and Sleeping Unit Enclosures; Airtightness of Heating and Cooling Air Distribution Systems; and Airflow of Mechanical Ventilation. The new edition will include all interpretations of the 2019 edition and provide additional clarifications. The significant changes proposed in the draft in addition to those in the Addenda and interpretations are as follows:


  1. Definitions:
    1. Added and/or aligned the following definitions from 301 and 310:
      • Attached Dwelling Unit
      • Blower Fan
      • Detached Dwelling Unit
      • Dwelling Unit Mechanical Ventilation System
      • Exhaust Ventilation System
      • Forced-Air HVAC System
      • HVAC System
      • Occupiable Space
      • Residential Building
      • Shall
    2. Proposed a definition for Ventilation that varies slightly from 301.
    3. Modified the definitions for CFA, CSV, USV, and IV to simplify and align with the revised logic for IV.
  2. In response to IR 380-2019-005, added a section to address pet door configuration during infiltration test.
  3. In response to IR 380-2019-006, changed the set up for attached garages to always create an unrestricted air pathway larger than 20 square feet between the attached garage and outside. This is will result in more consistent results, regardless of whether the blower door is setup in the garage or at another location in the house. Also, the language to “create an unrestricted air pathway larger than 20 square feet” aligns with instructions elsewhere in the standard.
  4. In response to IR 380-2019-004, revised the setup of attics, crawlspaces, basements, and adjacent mechanical closets for the infiltration test. Essentially, they’re only included in the infiltration test and Infiltration Volume if they’re adjacent to and “dedicated” to (meaning they do not span multiple Dwelling Units undivided) the subject Dwelling Unit and:
    1. They’re Conditioned Space Volume, or,
    2. For attics, they are unvented and the thermal and air barrier has been moved to the roof deck and exterior walls;
    3. For crawlspaces and basements, they are unvented and the thermal and air barrier has been moved to the exterior walls;
    4. For mechanical closets adjacent to the Dwelling Unit, they are unvented, only contain equipment serving the subject Dwelling Unit, and the wall assembly between it and the subject Dwelling Unit is not air sealed.
  5. In response to IR 380-2019-003, the setup of dampers and openings for ventilation for infiltration test, duct leakage test, and ventilation airflow test have been revised for consistency and to make the setup easier for Raters by providing more flexibility on where to seal.
  6. Added an allowance to use the airflow resistance device method for ventilation systems with multiple branches, as long as all inlet terminals are tested at the same time. This is being done by some Raters today and should produce accurate results.
  7. In response to stakeholder feedback, added several test methods for measuring ventilation air:
    1. Vane anemometer with flow hood at the inlet terminal or outlet terminal
    2. Hot wire anemometer mid-stream in the vent duct
    3. Non-averaging velocity pressure probe mid-stream in the vent duct

Also, moved the procedure for an airflow test station to its own procedure and clarified the intent that it is a permanently-installed airflow measurement device that measures either velocity pressure or static pressure across an in-line aperture of known area (e.g., an iris damper with static pressure tap). Lastly, moved the integrated diagnostic tool to its own section for improved clarity.

  1. Removed Section 7, which was a one-line reference to ASHRAE 152 and ASTM E1554 for measuring air handler airflow, now that Std 310 is done.
  2. Updated Informative Annex A to align with revised standard and improve clarity.
  3. Minor formatting changes


This first draft, PDS-01, of BSR/RESNET/ICC 380-202x is submitted for public comment for 45 days. The changes shown in draft PDS-01 by strike-through and underline and red print are open for comment. To review and comment on the Draft follow the links below.

Draft PDS-01, BSR/RESNET/ICC 380-201x

Comment on Draft PDS-01, BSR/RESNET/ICC 380-201x

View comments on Draft PDS-01, BSR/RESNET/ICC 380-202x

The public comment period will be open for 45 days from January 1, 2021 through February 15, 2021. Comments will be accepted only on text in draft PDS-01 shown by strike-through and underline and in red print.


Tips and Reminders for Submitting Public Comments 

  • Comments must pertain to text in draft PDS-01 that is shown as either strikethrough or underlined and red print. Comments on portions of draft PDS-01 where no change is indicated will be rejected.
  • Comments must include a specific proposed change to the text of the draft open for comment. Proposed added text must be underlined and text proposed to be removed must be shown using strike-through. If not submitted in this format, the public comment may be rejected.
  • Do not submit comments on standards other than this one that is out for public comment.
  • If you submit public comment representing the collective interests of a group of stakeholders, you are encouraged to submit ONE public comment and identify all stakeholders in that comment. While not required, this expedites the ability of the committees to respond to commenters in a timely manner.
  • Public comments are reviewed by committees with volunteer members, that are Raters, Providers, Software Developers and other industry and public interest stakeholders. They are not reviewed by RESNET Staff.
  • Most amendments to RESNET standards are proposed by industry and public stakeholders not RESNET. To learn more about submitting proposed amendments visit this page: https://www.resnet.us/about/standards/submit-proposed-amendments/