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Is a HEPA filter less efficient at particle sizes smaller than 0.3 microns?

April 26, 2017filter HEPA microns particle smaller

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Is a HEPA filter less efficient at particle sizes smaller than 0.3 microns?

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• The 0.3 micron size was selected for HEPA testing because it is the most difficult to capture. Testing by filter manufacturers and filter testing companies has shown that HEPA filters can actually be more efficient than 99.97% for capturing particles smaller or larger than 0.3 microns.