Air Handler Sizing Calculator
Size from System Tonnage
Calculate air handler specs from cooling/heating tonnage
Formula
CFM = Tonnage x CFM/Ton | 1 Ton = 12,000 BTU/hr
Frequently Asked Questions
What is CFM per ton?
CFM per ton is the airflow rate per ton of cooling. Standard is 400 CFM/ton. Humid climates use 350 CFM/ton for better dehumidification. Dry climates use 450 CFM/ton.
How do I size an air handler?
Match the air handler to your outdoor unit tonnage. Ensure it can deliver the required CFM at the available external static pressure. Consider heating capacity needs as well.
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