I am building a small 6' x 8' x 7' tall paint spray booth. It will have one open wall for air intake, and I need to add an exhaust fan on the other end. I plan to spray both water based and oil based finishes, and some will likely be flamable, but not overly explosive. I've looked at explosion proof fans, but the are cost prohibitive. I'm sure there must be some way to make a resonabley priced fan somewhat explosion proof. Can anyone help?