Sorry… I did not say that at all. Please, I do not want to argue with anyone. Yes, I do have a reasonable grasp of dust collection and personal protection equipment as I dealt with it for many years in my work environment. We used N100 masks with certified fit tests or cartridge type masks. I wore a mask or filter almost everyday.
I am going to leave it with this……breathing dust is not good for you. Anyway that one can mitigate the effects of dust in a shop is good. The more you can reduce the dust you breath the better. Finer dust particles are dangerous as they can be pulled farther into your lungs and the small particles can stay in the air for a long time.