Cawley,
For a 1 car size paint booth I find that 2 of those 24 inch floor fans are a good starting point for the hobbyist. They are cheap and disposable (if worn out) and easy to tune with cardboard and duct tape for airflow. Filter the air coming in and filter the exhaust air. HEPA furnace filters work great and are easily disposed of. Keep an eye on the motor area for paint build up. Anything more than painting a few personal cars you need commercial explosion proof fan(s).
I can`t stress enough the importance of personal protection while slinging paint. A hobbyist doesn`t need to suffer or die when working on his own vehicles.
Be safe.
sscuda
