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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.

Evacuation of Air - Capture Velocity
- v1 -
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
Evacuation of Air - Capture Velocity
Process BathsRequired Capture Velocity
- v1 -
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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