Evacuation of Air - minimum Capture Velocities to avoid Pollution products transferred to the Room
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The tables below indicates necessary capture velocities of evacuating air in distance x from outlet openings to avoid pollution products transferred to surrounding rooms and environments.
The pollution source is in distance - x - from the outlet opening.
| Process | Product speed | Velocity - v1 - | |
|---|---|---|---|
| (m/s) | (fpm) | ||
| Galvanic baths, stain baths, kitchen hoods, smith hoods etc. | small | 0.2 - 0.5 | 40 - 100 |
| Spray painting, unloading and loading of bags, welding etc. | moderate | 0.5 - 1.0 | 100 - 200 |
| Unloading moulds | high | 1.0 - 2.0 | 200 - 400 |
| Grinding, honing, sand blaster etc. | very high | 3.0 - 10.0 | 600 - 2000 |
| Process Baths | Required Capture Velocity - v1 - | |
|---|---|---|
| (m/s) | (fpm) | |
| Hardening | 0.4 | 80 |
| Stain, cold | 0.3 | 60 |
| Stain, hot | 0.5 | 100 |
| De-fating | 0.3 | 60 |
| Galvanic, chrome or cadmium | 0.4 | 80 |
| Water, not boiling | 0.2 | 40 |
| Water, boiling | 0.4 | 80 |
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Design of systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.
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