Hello,
I seem to remember some great advice on sizing an explosion proof exhaust fan to the size of your booth, but my search skills suck.
Anyone have the formula/ratio for determining the correct size fan?
My booth is 12 X 20 and I presently have about a 1000-1200 cfm fan exhausting fumes, which is working, but very slow. Takes about 5-6 minutes to get all the overspray/fumes out. I want to go bigger to speed up the evacuation.
Lee
Replies
I think OSHA requires something like 100 ft/min air speed through the space. While I doubt that you would want to move that much air, it might give you some idea of where to go with this, like 20-25 ft/min, or maybe a bit more.
If your space is 8' high and 12' wide, and assuming the inlet filters are spaced or baffled to spread out the incoming air across the short wall (same with the exhaust), then you have 96 ft^2 cross sectional area. To move air at 25 ft/min across the whole area, you need to move air at 2400 ft^3/min, which isn't really all that much, but is about twice what you have now. If you're looking at fan curves, be sure to allow for enough delta-P to move air through dirty filters.
Be seeing you...
TK,
Thanks for the reply. I was thinking about twice as much as I have now might be about right. A little more wouldn't hurt.
Lee
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