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# Air Duct Velocities

## Typical air duct velocities in applications like ventilation systems or compressed air systems.

Air velocities in ducts and pipes should not exceed certain limits to avoid high pressure loss and unacceptable noise generation. The values below can be used as guidelines for some typical applications.

Air Duct Velocities
Air DuctsAir Velocity
(m/s)(ft/min)
Combustion air duct 12 - 20 2400 - 4000
Air inlet to boiler room 1 - 3 200 - 600
Warm air for house heating 0.8 - 1.0 150 - 200
Vacuum cleaning pipe 8 - 15 1500 - 3000
Compressed air pipe 20 - 30 4000 - 6000
Ventilation ducts in hospitals 5 - 8 1000 - 1500
Ventilation ducts in office buildings 7 - 11 1200 - 2000

## Related Topics

• ### Ventilation Systems

Design of systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

## Related Documents

• ### Air Ducts - Friction Loss Diagram

A major friction loss diagram for air ducts - Imperial units ranging 10 - 100 000 cfm.
• ### Air Ducts - Friction Loss Diagram

A major friction loss diagram for air ducts - SI units.
• ### Air Ducts - Major Friction Head Loss, Online Calculator

Head loss or major loss in air ducts - equations and online calculator for rectangular and circular ducts - Imperial and SI units.
• ### Air Ducts - Minor Loss Coefficient Diagrams

Minor loss coefficient diagrams for air ductwork, bends, expansions, inlets and outletsĀ  - SI units.
• ### Air Ducts - Sizing

Required duct area vs. air flow.
• ### Air Ducts - Velocity Diagram

Air flow volume, duct size, velocity and dynamic pressure.
• ### Duct Sizing - the Equal Friction Method

The equal friction method for sizing air ducts is easy and straightforward to use.
• ### Duct Velocity

Calculate velocities in circular and rectangular ducts - imperial and SI-units - online calculator.
• ### Ducts Sizing - the Velocity Reduction Method

The velocity reduction method can be used when sizing air ducts.
• ### Rectangular Air Ducts - Velocity Diagram

Velocity diagram for rectangular air ducts - metric units.

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## Citation

• The Engineering ToolBox (2003). Air Duct Velocities . [online] Available at: https://www.engineeringtoolbox.com/flow-velocity-air-ducts-d_388.html [Accessed Day Month Year].

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7.8.15

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