1. What is CFM Calculation?

CFM (Cubic Feet Per Minute) calculation determines the volumetric flow rate of air or other gases. It's calculated by multiplying FPM (Feet Per Minute) by the cross-sectional area through which the air is flowing.

2. How Does the Calculator Work?

The calculator uses the CFM formula:

Where:

• \( CFM \) — Cubic Feet Per Minute (ft³/min)
• \( FPM \) — Feet Per Minute (ft/min), fixed at 1300
• \( Area \) — Cross-sectional area (ft²)

Explanation: This formula calculates the volume of air moving through a given area per minute when the velocity is known.

3. Importance of CFM Calculation

Details: CFM calculation is essential for HVAC system design, ventilation requirements, industrial airflow measurements, and ensuring proper air circulation in various applications.

4. Using the Calculator

Tips: Enter the cross-sectional area in square feet. The FPM value is fixed at 1300. The area must be a positive value greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What does CFM measure?
A: CFM measures the volume of air flow in cubic feet per minute, indicating how much air is moving through a space.

Q2: Why is FPM fixed at 1300 in this calculator?
A: This calculator is specifically designed for converting 1300 FPM to CFM, which is a common velocity used in various airflow applications.

Q3: How do I calculate the area for CFM calculation?
A: Area is typically calculated as the cross-sectional area through which air flows. For ducts, it's π × (diameter/2)² for round ducts or width × height for rectangular ducts.

Q4: What are typical CFM values for different applications?
A: CFM requirements vary widely - from 50-100 CFM for bathroom fans to 1000-2000+ CFM for whole-house ventilation systems.

Q5: Can I use this calculator for different FPM values?
A: This calculator is specifically designed for 1300 FPM. For other FPM values, you would need to use the general formula CFM = FPM × Area with your specific FPM value.