Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! 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 Ducts Air 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 Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more. Related Documents A major friction loss diagram for air ducts - Imperial units ranging 10 - 100 000 cfm. A major friction loss diagram for air ducts - SI units. Head loss or major loss in air ducts - equations and online calculator for rectangular and circular ducts - Imperial and SI units. Minor loss coefficient diagrams for air ductwork, bends, expansions, inlets and outlets - SI units. Required duct area vs. air flow. Air flow volume, duct size, velocity and dynamic pressure. The equal friction method for sizing air ducts is easy and straightforward to use. Calculate velocities in circular and rectangular ducts - imperial and SI-units - online calculator. The velocity reduction method can be used when sizing air ducts. Velocity diagram for rectangular air ducts - metric units. Search
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