Review on 3M 2091 Particulate Filter Pairs by Mario Beckwith

Works with 3M 6000/6100/6200 respirators that I use with 3D printed exhaust filter (Thingiverse 4311836) better than a COVID sheet mask . Looks a bit strange, but seals and filters well like N95. These filters are rated for 40 hours of use and appear to offer better value for money than N95 masks. CDC and NIOSH are approved (check their list of approved respirators online), but airlines won't let you fly them even if you block or filter the exhaust port. In all other cases this is a much better choice than a cloth or surgical mask in my opinion as they seal much better.