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What are HEPA, ULPA, SULPA and Ultimate ULPA?

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What are HEPA, ULPA, SULPA and Ultimate ULPA?

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HEPA (High-Efficiency Particulate Aerosol) – HEPA filter has a minimum particle collection efficiency of 99.97% for particles 0.3 microns in diameter. ULPA (Ultra Low Penetration Aerosol) – ULPA filter has an efficiency of 99.999% for particles in the most penetrating particle size at the specified media velocity. The most penetrating particle size is the particle diameter when penetration through the media is highest. SULPA (Super ULPA) – At an efficiency of 99.9999% these filters are based on the same standard as the ULPA filters. Ultimate ULPA – At an efficiency of 99.9999999% these filters are based on the same standard as the ULPA filters.

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