What is the difference between KF94 and KF80?

->The performance of a health mask to block particles is indicated by the numbers folloing KF(Korea Filter) characters.

KF80 blocks more than 80% of 0.6 um fine particles and KF94 blocks more than 94% of 0.4um fine particles

 * What is the BFE rating of these masks?

-> 99.9%

For example, Filter Grade : KF94 > KF80 > KFAD = BFE 99%

KF94 is the best filter, but KF80 is enough to protect.