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Heating & Air Conditioning
tomyj

Duct Fan Capacity

17 years ago

Could anyone please tell me how to find the actual capacity of a duct fan in use. I find fan ratings called "free air"; however, the recipient duct is already delivering air at 217 CFM. The room requires 369 CFM to meet the calculated required tons of A/C and I want to improve not impede the current airflow.

Thank you.

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