Gregg, I used a Dayton 1TDP3; it's 75 CFM which should be sufficient for my booth without being noisy. If I were to build a bigger paint arena, then I would probably go above 100 CFM beginning with a 1TDP2 104 CFM but maybe as high as a 1TDP5 131 CFM or 1TDP7 146 CFM. Purchasing decision may be governed by price vs. performance. It is important that the blower motor not be in the moving contaminated air, but one has to provide for cooling air circulation in some manner. Airborne solvent vapors would attack the lubrication of the bearings. I pre-lubed mine with LaBelle 106 with PTFE since it is superior to oil, so I should not have to worry about maintenance.