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Research -

HEPA filters, as defined by the United States Department of Energy (DOE) standard adopted by most American industries, remove at least 99.97% of airborne particles 0.3 micrometers (μm) in diameter. This doesn't mean that particles smaller an 0.3µm do not get caught in the filter. Our UltraHEPA™ H13 will filter viruses down to 0.003 microns. 

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