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Manual-D is ACCA's duct design method for properly sizing the airflow pathways – the ductwork – within a residential heating and cooling system. Manual D, from the Air Conditioning Contractors of America (ACCA), provides a single set of ANSI recognized duct sizing principles and calculations that ACCA Manual D Duct Design (3rd Edition) The residential duct system is designed to match the heating and cooling equipment blower capacity. The Manual D duct Manual D is the ACCA method used to determine the overall duct layout and sizes in HVAC design. Once you know how much A/C you need, what equipment you haveRight-D® is a fast, easy-to-use residential duct sizing and calculation software that takes full advantage of ACCA's and ANSI's standard Manual D Method. The Third Edition of ANSI/ACCA Manual D is the Air Conditioning Contractors of America procedure for sizing residential duct systems. This procedure.