1. What is CFM to FPM Conversion?

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: This formula converts volumetric flow rate to linear velocity by dividing the flow rate by the cross-sectional area through which the air is moving.

3. Importance of FPM Calculation

Details: Calculating FPM is crucial for proper duct sizing, ventilation system design, air balancing, and ensuring adequate airflow for comfort and safety in various applications.

4. Using the Calculator

Tips: Enter CFM value in cubic feet per minute and area in square feet. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between CFM and FPM?
A: CFM measures volumetric flow rate (volume per minute), while FPM measures linear velocity (distance per minute).

Q2: When is this conversion most commonly used?
A: Primarily in HVAC design, ventilation systems, ductwork sizing, and industrial airflow applications.

Q3: What are typical FPM values for different applications?
A: Residential ducts: 600-900 FPM, commercial ducts: 1000-2000 FPM, exhaust systems: 1500-3000 FPM depending on application.

Q4: How does duct shape affect the calculation?
A: The formula uses cross-sectional area, so circular, rectangular, or oval ducts can be used as long as the area is correctly calculated.

Q5: Can this formula be used for liquids as well as air?
A: Yes, the principle applies to any fluid, but the units must be consistent (CFM and square feet for FPM result).