1. What is CFM and FPM?

CFM (Cubic Feet per Minute) measures volumetric flow rate, while FPM (Feet per Minute) measures velocity. The conversion between them requires knowing the cross-sectional area through which air or fluid is flowing.

2. How Does the Calculator Work?

The calculator uses the fundamental flow rate formula:

Where:

• \( CFM \) — Cubic Feet per Minute (flow rate)
• \( FPM \) — Feet per Minute (velocity)
• \( A \) — Cross-sectional Area (square feet)

Explanation: This formula converts velocity to volumetric flow rate by multiplying by the area through which the fluid or air is moving.

3. Importance of CFM Calculation

Details: CFM calculations are essential in HVAC systems, ventilation design, industrial processes, and fluid dynamics to ensure proper airflow and system performance.

4. Using the Calculator

Tips: Enter velocity in feet per minute and area in square feet. Both values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between CFM and FPM?
A: FPM measures how fast air moves (velocity), while CFM measures how much air moves (volume per time).

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

Q3: How do I measure the area for calculation?
A: For ducts/pipes, measure width and height (or diameter) and calculate cross-sectional area in square feet.

Q4: Can I use this for liquids as well as air?
A: Yes, the principle applies to any fluid, though units may need adjustment for different measurement systems.

Q5: 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 application.