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What is high-efficiency particulate air (HEPA) filter?

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The high-efficiency particulate air (HEPA) filter is the best-known air filter. It was developed during World War II to prevent radioactive particles from escaping from laboratories. To qualify as a true HEPA filter, it must be able to capture at least 90% of all particles measuring 0.3 microns or larger that enter it.

From: Asthma and Air Filters WebMD Medical Reference

Reviewed by Nayana Ambardekar on July 07, 2018
Reviewed by Nayana Ambardekar on July 07, 2018

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How effective is the ultra high-efficiency particulate air (HEPA) filter?

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