Duct velocity represents the speed of air flowing through an HVAC duct. Proper air velocity is essential for efficient airflow distribution, noise control and system performance.
Duct Area = π × (Diameter ÷ 2)²
Air Velocity (FPM) = Airflow (CFM) ÷ Duct Area
Airflow = 1200 CFM
Duct Diameter = 14 inches
Estimated Duct Velocity ≈ 940 FPM
This calculator helps HVAC engineers determine proper duct air velocity during duct design.
Duct velocity is the speed of air flowing inside an HVAC duct, usually measured in feet per minute (FPM).
Typical recommended velocity ranges between 600–900 FPM for supply ducts and 900–1200 FPM for main ducts.
Proper velocity ensures balanced airflow, efficient cooling and reduced noise in HVAC systems.
Yes. High air velocity can cause duct noise, vibration and increased pressure loss.