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Air Volume Flow Formula:
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Air volume flow represents the quantity of air moving through a given cross-sectional area per unit time. It is commonly measured in cubic feet per minute (cfm) and is essential for HVAC system design, ventilation calculations, and industrial airflow applications.
The calculator uses the fundamental air volume flow equation:
Where:
Explanation: This equation calculates the volume of air passing through a duct, pipe, or opening by multiplying the area of the passage by the velocity of the air moving through it.
Details: Accurate air volume flow calculation is crucial for proper HVAC system sizing, ventilation design, industrial process control, and ensuring adequate air quality in buildings and industrial facilities.
Tips: Enter the cross-sectional area in square feet and air velocity in feet per minute. Both values must be positive numbers. The calculator will compute the volume flow rate in cubic feet per minute (cfm).
Q1: What units should I use for area and velocity?
A: Use square feet (ft²) for area and feet per minute (fpm) for velocity to get volume flow in cubic feet per minute (cfm).
Q2: Can I use different units?
A: Yes, but you'll need to convert all values to consistent units. Common alternatives include m² for area and m/s for velocity to get m³/s for volume flow.
Q3: What is a typical air velocity in HVAC systems?
A: Typical duct velocities range from 600-1200 fpm for low-pressure systems and 1200-2400 fpm for high-pressure systems.
Q4: How do I measure air velocity?
A: Air velocity can be measured using anemometers, pitot tubes, or thermal anemometers at multiple points across the duct cross-section.
Q5: Why is accurate air volume calculation important?
A: Proper airflow calculation ensures adequate ventilation, energy efficiency, comfort, and compliance with building codes and air quality standards.