Resources, Tools and Basic Information for Engineering and Design of Technical Applications!
mobile - visible on handheld devices - alternatively go to www.engineeringtoolbox.com!
Engineering ToolBox > Air Velocities in Ducts
Air velocities in ducts should not exceed certain limits to avoid high pressure losses and unacceptable noise generation. The values below are common guidelines for some typical applications.
| Air Ducts | Air Velocity | |
| m/s | ft/s | |
| Combustion air ducts | 12 - 20 | 40 - 66 |
| Air inlet to boiler room | 1 - 3 | 3.3 - 9.8 |
| Warm air for house heating | 0.8 - 1.0 | 2.6 - 3.3 |
| Vacuum cleaning pipe | 8 - 15 | 26 - 49 |
| Compressed air pipe | 20 - 30 | 66 - 98 |
| Ventilation ducts (hospitals) | 1.8 - 4 | 5.9 - 13 |
| Ventilation ducts (office buildings) | 2.0 - 4.5 | 6.5 - 15 |