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Necessary velocity of evacuation air to avoid pollution products from some common processed as galvanic baths, spray painting etc., to be transferred to the room and the surroundings
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The tables below indicates necessary velocity of outlet air in a distance x from the outlet opening to avoid pollution products to be transferred to the room. The pollution source is in distance x from the outlet opening.
| Process | Product speed | Velocity -
vx
(m/s) |
| Galvanic baths, stain baths, kitchen hoods, smith hoods etc. | small | 0.2 - 0.5 |
| Spray painting, unloading and loading of bags, welding etc. | moderate | 0.5 - 1.0 |
| Unloading moulds | high | 1.0 - 2.0 |
| Grinding, honing, sand blaster etc. | very high | 3.0 - 10.0 |
| Process Baths | Necessary speed -
vx
(m/s) |
| Hardening | 0.4 |
| Stain, cold | 0.3 |
| Stain, hot | 0.5 |
| Defating | 0.3 |
| Galvanic, chrome or cadmium | 0.4 |
| Water, not boiling | 0.2 |
| Water, boiling | 0.4 |
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