Up to date ACCA Guide D Residential Duct Techniques Out for ANSI Assessment

The Air Conditioning Contractors of America Instructional Institute Requirements Process Crew has introduced an American Nationwide Requirements Institute public evaluation interval for proposed revisions to ANSI/ACCA 1 Guide D – 2016, Residential Duct Techniques. The 45-day public evaluation interval began Feb. 23 with a remark interval deadline of April 8.

The proposed revisions are to the 4 “Normative Sections” of Guide D, which include the minimal necessities for conducting a residential duct system design. Revisions embody:

N1: Basic Necessities and Definitions

N2: Guide D Process

N3: Most Air Velocity and Switch Air Tables

N4: Becoming Equal Lengths

Guide D makes use of heating and cooling masses to find out area air supply necessities for residential purposes. The procedures match duct system resistance (strain drop) to blower efficiency (as outlined by the producer’s blower efficiency tables). This delivers applicable airflow to the rooms and areas, whereas making certain that system airflow is appropriate with the working vary of the HVAC gear. The capabilities and sensitivities of the procedures are appropriate with single-zone and multi-zone methods. The first gear might characteristic single-, multi- or variable-speed blowers.

Guide D can be referenced by the ICC Worldwide Residential Code and IAPMO Uniform Mechanical Code. Feedback, together with a duplicate of the proposed Normative Sections, might be obtained by contacting David Bixby, ACCA supervisor of codes and requirements at [email protected].