You are correct , glad I am this part of my build, all the metal work and body work can get to you, seemed like it wasn't going to end. I like the mechanical end of builds. Here are some pics of my Exhaust set up , the fan I used is a Confined space Air Ventilator, 12 inch Round 2 speed fan, with 1/2 enclosed motor. I also bought the exhaust hose that went with it. I got the idea from another member here. I just changed a couple things. I built a box about the same size of what six filters would take up, I used ( 25x16x4") furnace filters, there is about a 4" gap between the fan and the filters. In the back you can see I made an area where the fan goes, fits very snug to have a good seal, I used some sponge tape to help with sealing around the hole. Then I made another adapter to fit in the window where the other end of the hose goes to exhaust the filtered air out, this fan is very strong, I only used it on low speed. I also put some casters on the filter unit that way if I had to move it away from the booth I could use it in another part of the shop. This worked fantastic for me when I was in the booth.