Great post! No way to really get things perfect. Even if you brought both intakes on the same day, the temp and humidity changes slightly and ooops, variation. So at some point, it's "either it has it or it don't". Both days I think I had pretty good air quality. And both intakes went 8 hundredths of each other. That didn't surprise me, but the way they did it surprised me. I thought just the opposite..... but it's why I'm bent on "go see" :D