1. What is the CFM Calculation Formula?

The CFM (Cubic Feet per Minute) formula calculates airflow rate in a pipe or duct system. It represents the volume of air flowing through a specific cross-sectional area per minute.

2. How Does the Calculator Work?

The calculator uses the CFM formula:

Where:

• \( Velocity \) — Air velocity in feet per minute (ft/min)
• \( Area \) — Cross-sectional area in square feet (sq ft)

Explanation: The formula multiplies the air velocity by the cross-sectional area of the pipe to determine the volumetric flow rate.

3. Importance of CFM Calculation

Details: Accurate CFM calculation is essential for designing HVAC systems, determining ventilation requirements, and ensuring proper airflow in industrial applications.

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 units should I use for this calculation?
A: For this calculator, use feet per minute for velocity and square feet for area to get CFM (cubic feet per minute).

Q2: How do I measure air velocity in a pipe?
A: Air velocity is typically measured using an anemometer at various points across the pipe cross-section to get an average value.

Q3: What is a typical CFM range for residential HVAC?
A: Residential HVAC systems typically range from 400-2000 CFM depending on the size of the home and system capacity.

Q4: How does pipe diameter affect CFM?
A: For a given velocity, larger pipe diameters result in higher CFM values due to the increased cross-sectional area.

Q5: Can I use this formula for liquids as well as air?
A: Yes, the same formula applies to any fluid flow calculation, though the units may need to be adjusted accordingly.