Chiller Tons to CFM Calculator
Air handler airflow for a chiller load.
Enter your values
ⓘ Live results
Results
- Air handler airflow
- 20,000 CFM
- Chilled water flow
- 120 gpm
- Load in BTU/h
- 600,000
- Load in kW
- 175.8
- Pipe size at 6 ft/s
- 2.9 in dia
Quick answer
Air handler airflow for chilled water coils is typically 350-400 CFM per ton of cooling.
CFM = tons x 400; gpm = tons x 2.4
How to use the Chiller Tons to CFM Calculator
- 1Enter the chiller load in tons.
- 2Use 400 CFM per ton for comfort cooling, 350 for humid climates.
- 3Set the chilled water delta T — larger delta T means smaller pumps and pipes.
Worked example
Using the values the calculator loads with:
Inputs
- Cooling load50 tons
- CFM per ton400 CFM/ton
- Chilled water delta T10 °F
Results
- Air handler airflow20,000 CFM
- Chilled water flow120 gpm
- Load in BTU/h600,000
- Load in kW175.8
- Pipe size at 6 ft/s2.9 in dia
Frequently asked questions
Why lower CFM in humid climates?
Slower air across the coil gets colder and removes more moisture.
Typical delta T?
10°F is traditional; 12-16°F designs cut pumping energy substantially.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.