In 1990 when I bought my house there was a wooden shop bldg that we used as a band practice studio after lining inside walls with plywood and 1/2 inch styrofoam to sound proof. The J Teal Band quit and I watched the bldg just sit idle for years. I thought about shooting these guns in there but didn't want to suffocate in smoke. I bought a side mounted exhaust fan from Tractor Supply for around a $100. The smallest one. Fortunately I have a window air conditioner in front and pushes air to the rear where fan is mounted on rear right side. IT WORKS. Just an idea for you hobbists w/shop bldgs that might want to shoot in your own backyard.