‘Eurowings should be ashamed of how they handled this situation,’ says passenger

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    1 year ago

    As in, removing 99,97% of particles over 0.3 micron in size.

    HEPA filters remove 99.97% of particles that are 0.3 micron in size. (That is the size of particles they’re tested with, as it’s the most difficult to filter.) They remove over 99.97% of particles larger or smaller than 0.3 microns.