I've needed to do this for a long time now, so am assembling the components for a new paint booth. Doing this brings into mind a couple of questions. They are: How many CFM should the exhaust draw, to easily clear the booth, yet not suck people and furniture through? Is a bathroom exhaust style fan safe enough in this type of application, when using solvent based paints? Or do I need to seek a squirrel cage blower style, where the motor is isolated from the duct?