Air Velocities in Ducts
Recommended maximum air velocities in ventilation ducts
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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 |
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