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2020 3 23 · A reference by 3M in a technical bulletin* released in January 2020 demonstrates that the several country specific standards used to grade the FFR tend to converge into functional equivalence. N95 (US), KN95 (China) and FFP2 (EU) standards produce FFR devices that are similar enough to be interchangeable for the purposes of their use in a pandemic.

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3.KN95 masks and N95 masks are actually the same in terms of particle filtration efficiency. KN95 mask can be used for days and more serious situation as with better virus dust saliva filtering effect than disposable fack masks. Contact me if you have any [email protected], my name is Nicholas Daniel Witwicky.

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