Please forgive the "1.0 prototype" made out of cardboard. Wanted a quick proof of concept -- it's being replaced with the 2.0. Anyway, bringing in outside air for cooling miners is "effective", but tons of filth gets all over everything pretty quick. So, putting together some fans + filters to keep the worst of it from coming indoors. The "2.0" version is about half done. Need to drill holes in the plexiglass for the fans. Enjoy! Comments welcome.