Not really "for life" (in that sense anyway), but I missed the first thread so I'll put it here, with apologies. After a lot of research, for Christmas 2020 I got a few "Airpro" masks[1] ($40-50). In short, it's a wearable HEPA filter that pumps filtered air into any standard N95 or KN95 mask. In theory this gives better filtration (both from higher efficiency and positive pressure), but mainly I love it because it e…
That company went out of business as far as I can tell though, so it will be back to the Airpro when I run out of filters, if I can find it.