Air Duct Velocity & Flow Calculator

Circular Duct
Input Parameters
m³/h
Calculation Result
Air Velocity
0.00 m/s
Cross-sectional Area: 0.00 m²

How to Calculate Duct Air Velocity and Flow Rate?

Designing an efficient industrial ventilation, HVAC, or dust collection system requires precise sizing of air ducts. The relationship between volume flow rate (Q), air velocity (V), and duct cross-sectional area (A) is the foundation of fluid dynamics in engineering.

Continuity Equation: Q = V × A
  • Q: Volume Flow Rate (m³/s) — Note: 1 m³/s = 3600 m³/h
  • V: Air Velocity (m/s)
  • A: Cross-sectional Area (m²)

Recommended Air Velocities for Industrial Applications

Choosing the correct air velocity is crucial. If the velocity is too low in a dust collection system, particles will settle inside the duct. If it is too high, it causes excessive noise, friction loss, and high energy consumption.

Application Type Recommended Velocity (m/s)
Comfort HVAC (Offices) 3 – 6 m/s
General Industrial Exhaust 10 – 12 m/s
Light Dust (Wood chips, plastic) 15 – 18 m/s
Heavy Dust (Metal, sand, cement) 20 – 25 m/s

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