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A beard prevents a good seal on the face which renders the mark useless as the air will just flow through the gaps rather than the filter as it’s a path of much lower air resistance. I have to shave mine off before doing any dusty work for this reason.
If you can’t shave your beard off you’ll want to get a full face thing. Couple people I’ve worked with had this style and seemed to rate them.
https://www.safetecdirect.co.uk/products/pcapip602/jsp-powercap-active-ip-powered-respirator-th1p-dust-protection-cae602-941-100
Nef
aggi
Are any of these masks any good if you have a beard or are you a bit screwed anyway in that case?