3
votes
What is the difference between different mask standards?
The FFPx standards refer to the efficiency of the mask and the minimum particle size it filters out:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7248188/#:~:text=FFP1%20refers%20to%20the%20least,...
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1
vote
What is the difference between different mask standards?
EN149:2001+A1:2009 and EN149:2001+A1:2010 are European standards, with the year of ammendments at the end. Unfortunately, like you, I cannot find a definitive answer to the difference without paying €...
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