I googled mask filters on Revain and this and the carbon filter came up about a week ago. So I bought them and called 3M 800# on the box and they said they weren't made for that purpose. Honeywell recommended them. Not that it contained anything like glass or fiberglass, but not for that. I should have received a refund so don't buy for that purpose. I guess I'll just use my interface, which I paid 3x the masks for, and wait to get it. I'm also waiting for a rubber band because hair ties don't work. The RN sewing teacher said they had to contain non-woven fabric to filter out a virus that size.
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