1. What is FPM to CFM Conversion?

The FPM to CFM conversion calculates the volumetric flow rate (CFM - cubic feet per minute) from velocity (FPM - feet per minute) and cross-sectional area. This is essential in HVAC, ventilation, and airflow applications.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( CFM \) — Cubic feet per minute (volumetric flow rate)
• \( FPM \) — Feet per minute (velocity)
• \( A \) — Cross-sectional area (square feet)

Explanation: The formula converts linear velocity to volumetric flow rate by multiplying velocity by the cross-sectional area through which the air is flowing.

3. Importance of CFM Calculation

Details: CFM calculations are crucial for designing ventilation systems, determining airflow requirements, sizing ducts, and ensuring proper air circulation in buildings and industrial applications.

4. Using the Calculator

Tips: Enter velocity in feet per minute and area in square feet. Both values must be positive numbers. The calculator will provide the flow rate in cubic feet per minute.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between FPM and CFM?
A: FPM measures velocity (speed of air movement), while CFM measures volumetric flow rate (amount of air moving through a space).

Q2: When is this conversion used?
A: Commonly used in HVAC design, ventilation system calculations, duct sizing, and airflow analysis in industrial settings.

Q3: How do I measure the area for calculation?
A: Measure the cross-sectional area of the duct, pipe, or opening through which air is flowing. For rectangular ducts: width × height. For circular ducts: π × (radius)².

Q4: What are typical FPM values in ventilation systems?
A: Typically 500-2000 FPM for supply ducts and 300-900 FPM for return ducts, depending on the application and noise requirements.

Q5: Can this formula be used for liquids?
A: Yes, the same principle applies to any fluid flow, though units may need conversion (e.g., GPM instead of CFM for water flow).