But replace them at least every three months just to be safe. Free N95 masks where can i get a free N95 where can you find them near you? N95 filter N95 mask filter but how effective is N95 Respirator Mask? It is definitely important that you take safety measures if you intend on remaining beyond an infection-free. Nevertheless, if you freeze and also thaw your masks frequently, it could create concerns down the line. An N95 encounter mask is actually a respirator that shields versus particle issue in commercial or even non-industrial settings.