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As long as I know, the filters of KN95 or KN99 or FFP2 are working as the filter of KF94.
KF 94 masks can filterize the size of 0.4㎛. more than 94%
My mask-machines are for 30g and 40g.
If you can supply the material, please contact me.
My email is as below.
My We Chat ID is gongfeel