Hello, I did a search and did a lot of reading but did not fingers a answer or I missed it. I titled this post so someone might find it useful. So questions if my paint booth is 3ft long and 2 ft deep. What size a fan (CFM) would I need? I saw post a guy had 6 ft long booth with 2 motors that pulled up to 300cfm so if I am guessing I need 150 cfm? Thanks