Manual D is the ACCA protocol for designing a residential duct system. Traditionally residential duct systems are created using inaccurate one size fits all duct calculators or even worse contactor rule of thumb. The ACCA Manual D incorporates the Manual T air distribution protocol and makes sure the ductwork is sized to meet the performance needs of the selected system and comfort needs of the home. Designing using Manual D will allow contractors to satisfy modern building code requirements and avoid all too common complaints of temperature difference and excessive noise. Having a correctly designed duct system will avoid the trap of undersized ducts that leads to lower system capacity and decreased efficiency.
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