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by throw0101c
299 days ago
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> HEPA is just an acronym anyone can slap on anything, there's no accreditation. There are standards: > Filters meeting the HEPA standard must satisfy certain levels of efficiency. Common standards require that a HEPA air filter must remove—from the air that passes through—at least 99.95% (ISO, European Standard)[4][5] or 99.97% (ASME, U.S. DOE)[6][7] of particles whose diameter is equal to 0.3 μm, with the filtration efficiency increasing for particle diameters both less than and greater than 0.3 μm.[8] * https://en.wikipedia.org/wiki/HEPA * https://en.wikipedia.org/wiki/HEPA#Specifications |
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