How to Use the Fan Calculator
- Enter the Fan Diameter in inches. This is the diameter of the fan blades.
- Enter the Fan Speed in RPM (Revolutions Per Minute). This is how fast the fan is spinning.
- Optionally, enter the Air Density in lb/ft³. The default value is 0.075 lb/ft³ (standard air density at sea level).
- Click the Calculate button to compute the CFM and flow velocity.
- Click the Reset button to clear all inputs and results.
Understanding the Results
The calculator provides two key results:
- CFM (Cubic Feet per Minute): This measures how much air the fan moves per minute. Higher CFM means more air movement, which is useful for cooling, heating, or ventilation applications.
- Flow Velocity (feet per minute): This measures how fast the air is moving past a point near the fan. It helps in understanding the fan's performance characteristics.
Formula Explanation
The calculator uses the following formula to calculate CFM:
CFM = π × (D²/4) × V
Where:
- π is the mathematical constant Pi (approximately 3.14159)
- D is the fan diameter in feet
- V is the flow velocity in feet per minute
Practical Applications
This calculator is useful for:
- Designing ventilation systems
- Choosing the right fan for cooling electronic devices
- Calculating air movement in HVAC (Heating, Ventilation, and Air Conditioning) systems
- Understanding fan performance in various applications