HEPA stands for High Efficiency Particulate Air. HEPA standard filters can filter particulate matter upto 0.3 microns and that's the reason HEPA type air purifiers are usually considered the most effective type of air purifiers but these days with advancement in technology we have filters which are a notch better than the HEPA standard . For instance the new patented e2f filter employed in our Clair range of air purifiers can capture particles upto 0.1 microns in size making the particulate capturing efficiency of e2f filter slightly higher than the standard HEPA air purifiers.
HEPA is a type of air purifier. It stands for high-efficiency particulate air. To qualify as a HEPA filter by government standards the filter must remove 99.7% of all particles larger than 0.3 micrometers from the air. The following site lists the top 10 HEPA purifiers available online - http://www.air-purifiers-america.com/AP101_top10.asp.
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