Evacuation of Air - minimum Capture Velocities to avoid Pollution products transferred to the Room

Capture velocity to avoid pollution products from galvanic baths, spray painting boxes and more contaminating the surrounding room and environment

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The tables below can be used to indicate necessary capture velocity of evacuating air in a distance - x -  from the outlet opening to avoid pollution products transferred to the surrounding room and environments.

The pollution source is in a 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
Defating 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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