Ductulator - Duct Diameter Calculator

Enter the required volume & velocity to see the necessary duct diameter.


Health and Safety Executive recommended minimum duct velocities:

Type of contaminant Indicative duct velocity, m/s
Gases and non-condensing vapours No minimum value
Condensing vapours, fume and smoke Up to 10
Low or medium density, low moisture content dusts (plastic dust, sawdust), fine dusts and mists Up to 15
Process dust (cement dust, brick dust, wood shavings, grinding dust) Around 20
Large particles, aggregating and damp dusts (metal turnings, moist cement dust, compost) Around 25