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air filters in cloth masks?
(slrpnk.net)
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I don't know if they're still selling them, but I have masks from Outdoor Research which have removable, replaceable filters. They are not (K)N95 rated, however.
Edit: I should have just looked it up really quickly. They are still available if you're interested in trying those. It looks like they're going to stop producing/selling them soon.
https://www.outdoorresearch.com/collections/face-masks-and-filters
thank you!
Happy to help. As a bonus, they are super cheap right now, so there shouldn't be too much of a burden giving them a try, if that's what you go for. Good luck!