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Return Air

1492 Views 4 Replies 3 Participants Last post by  dbmet
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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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
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