What is the KF grade for the 3M 8822 fine dust mask?

I saw a comment recommending a fine dust mask for 3M 8822.

I heard that this is a first-class mask that is faithful to the basic functions and has a good price.

The grade comes out as N95.

How much is this if I change it to KF grade?

646 2019-03-11 Gentleman

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