That jolted me to be more conscious of the air I was breathing. To challenge the PM1200, I wore a respirator and blasted everything in my shop with jets of compressed-air, stirring up a smog-quality haze. I set the cleaner on its highest of three speeds (nearly 1,200 cfm) and left for an hour. When I returned the air looked crystal clear again, and very little dust had settled onto my tools. Rated to trap as much as 85 percent of 1-micron-sized dust particles, this air cleaner makes me confident I can breathe easier in my shop. The remote-controlled PM1200 has a built-in timer that you set for up to nine hours. —Tested by Bob Wilson