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Duct Velocity

Calculate velocities in circular and rectangular ducts - imperial and SI-units - online calculator

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Imperial Units

The velocity of air in a ventilation duct can be expressed in imperial units like

vi = qi / Ai = 576 qi / (π di2) = 144 qi / (ai bi)         (1)

where

vi = air velocity (ft/min)

qi = air flow (cfm)

Ai = area of duct (square feet)

di = diameter of duct (inches)

ai = width of duct (inches)

bi = width of duct (inches)

Imperial Units Air Flow Velocity Calculator

Air velocity can be calculated with the calculator below. Add air volume - q - and diameter - d - (or length a and b).

Air volume - qi - (cfm)

Diameter - di - (inches)

or alternatively

Length side - ai - (inches)

Length side - bi - (inches)

SI - Units

Air velocity in a duct can alternatively be expressed in SI units like

vm = qm / Am = 4 qm / (π dm2) = qm / (am bm)         (2)

where

vm = air velocity (m/s)

qm = air flow (m3/s)

Am = area of duct (m2)

dm = diameter of duct (m)

am = width of duct (m)

bm = width of duct (m)

SI Units Air Flow Velocity Calculator

Air velocity can be calculated with the calculator below. Add air volume - q - and diameter - d - (or length a and b).

Air volume - qm - (m3/s)

Diameter - dm - (m)

or alternatively

Length side - am - (m)

Length side - bm - (m)

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Related Topics

  • Ventilation Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more

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