HEPA stands for Technology, "High Efficiency Particulate Air" was developed in the 1940s to filter radioactive particles polluting.
HEPA filters are composed by a filter randomly woven by fiberglass very little crystal diameter from 0.5 to 2.0 micrometers only. Because HEPA filters are so closely knit, it can capture tiny particles that the vacuum cleaner uses non-standard filter is.
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