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Question:

What does "first effect, medium efficiency, high efficiency air filter" mean?

What does "first effect, medium efficiency, high efficiency air filter" mean?

Answer:

First effect filter more than PM10 large particles of dust,
Jul 4, 2017
medium efficiency filter about PM5 particles, efficient use of HEPA filtration,
Jul 4, 2017
PM2.5 purification efficiency of up to 97%, that is to say, they filter effect is different
Jul 4, 2017

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