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Calculate the correct return air grille and register sizes for your HVAC system based on CFM and acceptable velocity.
Undersized return grilles are the most overlooked cause of HVAC problems. They create high static pressure, noisy operation, and reduced airflow that strains the blower motor and reduces system capacity. A general rule: 1 sq ft of return grille per ton of cooling, but velocity-based sizing is more accurate.
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