4 Aug 06 0:28
I am guessing that ACGIH is the American Council of Government Industrial Hygenists. They publish a book on Industrial Ventilation.
Paint booth ventilation is such a common application that the problem is addressed by a number of Ventilation textbooks. I think the ASHAE manual does not go into it because it is not the core subject of air conditioning and refrigeration.
There are a number of points to watch with paint booths
1 - if the air velocity is too high the wet paint will start to run and disturb the finish
2 - the air must be filtered - otherwise dust will be attracted to the wet paint
3 - the exhaust will carry droplets of paint. This tends to build up on the inside of the ducts, and on the surface of the fan blades
4 - you cannot discharge paint into the atmosphere - so you have to make a plan to clean up the discharge. Often spray chambers are used to trap the paint droplets
5 - a small hood may work with a kitchen propeller fan, but for a larger volume you will need a centrifugal fan. The pressure drops involved will also dictate this. Talk to a fan Vendor for a recommendation
6 - it is important that the air distribution is as even as practical - to prevent fast moving streams developping in the painting space