Anonymous
Post 01/11/2022 22:07     Subject: Mask filtration efficacy
Anonymous wrote:You can also add filter material to any face mask and increase the efficacy - you don’t have to buy these brands


Only if the design is such that air doesn’t go around either the mask or the filter. Good luck!
Anonymous
Post 01/11/2022 20:37     Subject: Mask filtration efficacy
You can also add filter material to any face mask and increase the efficacy - you don’t have to buy these brands
Anonymous
Post 01/11/2022 09:37     Subject: Re:Mask filtration efficacy
Anonymous wrote:Are Happy Masks cloth masks?


Yes.
Anonymous
Post 01/11/2022 09:36     Subject: Re:Mask filtration efficacy
Are Happy Masks cloth masks?
Anonymous
Post 12/21/2021 09:23     Subject: Mask filtration efficacy
Thanks for this!
Anonymous
Post 12/21/2021 09:12     Subject: Mask filtration efficacy
Just thought I'd share in case anyone else finds this helpful...



from wirecutter:
https://www.nytimes.com/wirecutter/reviews/best-cloth-face-masks/