A little off topic, but I just picked up my shop air cleaner.
Its not a substitute for a mask, but hopefully will keep my shop a little cleaner.
I have it running on high right now in my basement, sitting on dollies so I can move it around, and every once in a while I go down to my basement and use my leaf blower to stir up the dust all over my basement.
They generally sell them in either 500 cfm or 1000-1200 cfm versions. I have a big shop, but almost went for the small version just because the big ones are so darn big and heavy. But then Busy Bee had a sale on the big one, so I had to do it. They have a "5 micron" disposable pleated filter and a "1 micron" washable bag filter.
Probably they make most of their profit on the proprietary replacement filters. The opening for my disposable filter is just under 12" x 24" (by 1") but I guarantee you that when it needs replacement, a cheap 12" x 24" MERV 8 furnace filter is going to fit. I think furnace filters are commonly a little undersized from the nominal dimensions, so I am likely good in the 24" direction. The 12" direction is a little smaller, so that might take a little work.