Fan Selection Calculator
Select an HVAC or industrial fan by calculating brake horsepower, motor size, estimated tip speed, noise level, and annual energy consumption.
Inputs
CFM
in. WG
%
%
Results
Brake Horsepower
2.25 HP
Motor Size
3 HP
Estimated Tip Speed7,540 ft/min
Noise Estimate61 dB
Annual Energy Use16,320 kWh
How to Use This Calculator
- Enter the required Airflow Rate in CFM based on ventilation or process load calculations.
- Enter the total Static Pressure in in. WG — sum ductwork friction, filter loss, and fitting losses for the system curve.
- Set the Fan Efficiency: forward-curved blades ≈ 60–70%, backward-curved ≈ 75–85%, airfoil ≈ 80–90%.
- Set the Motor Efficiency: standard efficiency motors ≈ 85–90%, premium efficiency ≈ 92–96%.
- Read the Brake Horsepower and the recommended Motor Size (next standard HP above BHP).
- Review the Annual Energy Use in kWh to evaluate lifecycle operating cost for the selected fan.
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