That makes perfect sense, Esko, and Rick. It'd pull both the volatile vapour and particles down to where you neither breathe them, nor can the particles settle on your finish.
The cheapest way would be to pull/push filtered air into the booth, and have a big exit vent down by the floor. But an explosion proof motor~fan in that big low vent would be a way more efficient system. You'd still need a very large filtered air vent coming in though. The slower the air velocity coming in, the more effective the filtration will be.