DOE) of particles whose diameter is equal to 0.3 μm, with the filtration efficiency increasing for particle diameters both less than and greater than 0.3 μm.
Common standards require that a HEPA air filter must remove-from the air that passes through-at least 99.95% ( ISO, European Standard) or 99.97% ( ASME, U.S. įilters meeting the HEPA standard must satisfy certain levels of efficiency. HEPA ( / ˈ h ɛ p ə/, high-efficiency particulate air) filter, also known as high-efficiency particulate absorbing filter and high-efficiency particulate arrestance filter, is an efficiency standard of air filter. HEPA filter corrugated internal structure and aluminium support along with the description of its functioning principle (interception, impact and diffusion of dust particles through a dense non-woven fiber material)
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