You actually clean your shop?
I have a basement shop. It's 20' x 30'. For 90% of my work, I work with hand tools, so that eliminates a lot of dust. I have a Rikon air cleaner that I run when I use my band saw, etc. A couple times a week, I'll run it for 4 hours after I finish for the day. I sweep at the end of the day, and more if needed. For me this works fine. But, I wouldn't mind having a shop like yours!