Honeywell (click here) RWS-54001 Dust & Nuisance Particulate Mask 50 Count
$28.09
They fit snuggly against the nose and can provide a good seal to prevent inhalation of DUST.
I bought a few of them today and I think if they are used with N95 filters BETWEEN two of them it will provide an excellent method of protection. The N95 filters can be purchased independently. The CONTRAMPTION will have to to be assembled so that it acts as one unit. I believe the N95 filter will provide a mask that can be used over a longer period of time than the usual disposable ones.
It could work.
Sandwich a N95 filter between two particle masks and be sure the entire unit fits well enough to provide a secure fit.
