HEPA is an acronym for "high-efficiency particulate air," also known as high-efficiency particulate absorbing and high-efficiency particulate arrestance.
HEPA air purifiers can capture particles the size of (and smaller than) the virus that causes COVID-19. And, according to this NASA study, the filters are capable of capturing ultra-small particles below the 0.3-micron HEPA test standard.
COVID-infected particles are approximately 0.125 micron (125 nanometers) in diameter and fall within the particle-size range that HEPA filters capture - that being, 0.01 micron (10 nanometers) and above.
Much attention has been given to HEPA filters recently and the role they play in combating the coronavirus on board airplanes.
But how do these filters work anyway?
In a recent video shot at Toronto Pearson International Airport, PAX caught up with Brian Krist, an aircraft maintenance engineer with Air Canada, to learn more.
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