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Understanding and Using a Return Air Duct Sizing Chart
"A return air duct sizing chart is a technical reference tool used by HVAC professionals and contractors to determine the correct cross-sectional dimensions of ductwork required to pull an appropriate volume of air back to the furnace or air handler. It matches airflow volume measured in cubic feet per minute (CFM) against allowable static pressure loss to maintain system efficiency and indoor air quality. The Critical Role of Return Air Ducts in HVAC Systems When evaluating residential and commercial heating, ventilation, and air conditioning (HVAC) systems, attention frequently centers on supply ducts—the channels that deliver conditioned ai..."
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