a 20x30 return will pull 5500 cfm. you need to have 2000 cfm. you need to check duct size tho, not just opening. need minimum 20x14 or 18inch round
Return Air
How much Return air is needed for a 5 ton system with the blower set on 2000cfm .. I currently have a 20x30 return air grill and I don't think that is big enough?
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