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ULPA is an acronym for "ultra-low penetration air." ULPA may also be used to refer to ultra low particulate air. A ULPA filter can remove from the air at least 99.999% of dust, pollen, mold, bacteria and any airborne particles with a size of 120 nanometres (0.12 µm) or larger.
A number of recommended practices have been written on testing these filters including
IEST-RP-CC001: HEPA and ULPA Filters,
IEST-RP-CC007: Testing ULPA Filters,
IEST-RP-CC022: Testing HEPA and ULPA Filter Media, and
- "IEST Recommended Practices". IEST. 2007-12-03. Retrieved 2008-01-14.
- ULPA Filter Efficiency Chart: Sentry Air Systems
- European Standard for HEPA & ULPA Filters - EN 1822
- EN 1822: the standard that greatly impacted the European cleanrooms market
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