Free Tool
Duct Velocity Calculator
Calculate the duct velocity and friction loss for your fume cupboard extraction system. Enter either the air volume directly or calculate it from sash dimensions and face velocity.
Fume Cupboard Duct Velocity Calculator
Duct Velocity: 0 m/s
Friction Loss: 0 Pa/m
Recommended Duct Velocities
According to BS EN 14175, the recommended duct velocity range for fume cupboard extraction systems is:
3 - 7.5 m/s
Optimal internal duct velocity
This ensures sufficient transport of contaminants whilst maintaining manageable noise levels and pressure losses.
How to Use
- 1 Select your input type - either direct air volume or sash dimensions
- 2 Enter your values (air volume in m³/s, or sash width/height in mm)
- 3 Enter the duct diameter in mm
- 4 Click Calculate to see the duct velocity and friction loss
Need Help?
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