ACCA ANNOUNCES ANSI PUBLIC REVIEW FOR PROPOSED REVISIONS TO MANUAL D® – 2016, RESIDENTIAL DUCT SYSTEMS
Alexandria, VA (July 3, 2025) - The Air Conditioning Contractors of America Educational Institute (ACCA-EI) Standards Task Team (STT) announces an American National Standards Institute (ANSI) public review period for proposed revisions to ANSI/ACCA 1 Manual D® –2016, Residential Duct Systems, as a revised industry standard.
The 30-day ANSI public review period will be from July 4, 2025, with a comment deadline of August 3, 2025.
This is the 3rd public review for proposed revisions to Manual D – 2016, and only involves the addition of three missing pages that were inadvertently omitted from the two previous public review drafts. The missing pages are found in Section N4. Fitting Equivalent Lengths; and are unchanged from the 2016 edition.
Manual D provides requirements and calculations for sizing residential HVAC duct systems, including return and supply ducts & registers, to distribute the correct amount of heating and cooling to each room based on the ACCA Manual J load calculation results.
A copy of the three missing pages can be obtained by going to the link shown below. Comments can be submitted by filling out and submitting the form at the same link.
ACCA ANSI Public Response Form - ACCA
For more information about Manual D® or ACCA, please contact Kate Wessels, ACCA vice president of communications, marketing, and partnerships at kate.wessels@acca.org or 703-824-8864.