Contact a air filtration company in your area, I got hooked up with a self contained filter box. It is 12" x 12", has a front mounted furnace type filter, center mounted sealed fan, and a charcoal filter pack at back. when I bought this for $50 I thought it cant be good, but it was. I can spray a model on a table with this behind it, no overspray, collects fumes and you cannot even tell if I sprayed a model on the coffee table, (no dear....I would never do that), you can reload the furnace filter when needed(about every 4 paint jobs, and the company will acid dip, and recharge your charcoal filter for $5, about every 30 paint jobs