HEPA was born in the three-year “Manhattan Project” in the United States in the 1940s. In the “Manhattan Project”, in order to prevent the spread of radioactive pollutants in the air, scientific researchers developed an efficient HEPA filter membrane, which was used In nuclear protection products such as biochemical suits, they are divided into various grades such as H12 to H17. For fine particles with a diameter of 0.3 microns or more, the filtration efficiency ranges from 99.7% to 99.9999%.
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