Fan Sizing Calculator

Size HVAC fans and calculate motor requirements

Fan Requirements

Airflow (CFM)

Static Pressure (in. w.g.)

Fan Type

Fan Efficiency

Motor Efficiency

Altitude (ft)

Air Temperature (°F)

Recommended Motor Size

0.5 HP

0.37 kW

Air Horsepower:0.189 HPBrake Horsepower:0.290 HPMotor Input:0.342 HPSpecific Fan Power:0.11 W/CFM

Density Factor:1.000Corrected Density:0.0750 lb/ft³Total Pressure:0.60 in. w.g.

New CFM:2200New SP:0.605 in. w.g.New BHP:0.387 HP

Energy Use:2287 kWhEst. Cost:$274.47/yearSound Level:52 dB

Typical Fan Efficiencies:

• Forward Curved: 60-70%

• Backward Curved: 75-85%

• Vane Axial: 70-80%

• Propeller: 50-65%