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Recommended velocities in ventilation ducts
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| Service | Velocity | |||
| Public buildings | Industrial plant | |||
| m/s | ft/min | m/s | ft/min | |
| Air intake from outside | 2.5 - 4.5 | 500 - 900 | 5 - 6 | 1000 - 1200 |
| Heater connection to fan | 3.5 - 4.5 | 700 - 900 | 5 - 7 | 1000 - 1400 |
| Main supply ducts | 5.0 - 8.0 | 1000 - 1500 | 6 - 12 | 1200 - 2400 |
| Branch supply ducts | 2.5 - 3.0 | 500 - 600 | 4.5 - 9 | 900 - 1800 |
| Supply registers and grilles | 1.2 - 2.3 | 250 - 450 | 1.5 - 2.5 | 350 - 500 |
| Low level supply registers | 0.8 - 1.2 | 150 - 250 | ||
| Main extract ducts | 4.5 - 8.0 | 900 - 1500 | 6 - 12 | 1200 - 2400 |
| Branch extract ducts | 2.5 - 3.0 | 500 - 600 | 4.5 - 9 | 900 - 1800 |
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