page_title: HEPA
section_title: Specifications
hierarchical_section_title: HEPA / Specifications
caption_attribution_description: English: A HEPA filtration unit used to clean air after a fire or air during manufacturing processes. Français&#160;: Exemple d'Unité portable de filtration HEPA (à haute performance). S'il répond aux normes HEPA, il peut purifier l'air dans un bloc médical d'urgence, ou après un incendie, des travaux, une pollution de l'air ou encore lors d'un processus de fabrication source de particules&#160;; Au moins 99,97% des particules en suspension (jusqu'à 0,3 µm) sont retenues. Le rendement volumique décroit avec l'encrassement. Une source d'électricité est nécessaire
context_page_description: High-efficiency particulate air, also known as high-efficiency particulate absorbing and high-efficiency particulate arrestance, is an efficiency standard of air filter.
  Filters meeting the HEPA standard must satisfy certain levels of efficiency. Common standards require that a HEPA air filter must remove—from the air that passes through—at least 99.95% or 99.97% 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. See the Mechanism and Specifications sections for more information.
  HEPA was commercialized in the 1950s, and the original term became a registered trademark and later a generic term for highly efficient filters. HEPA filters are used in applications that require contamination control, such as the manufacturing of disk drives, medical devices, semiconductors, nuclear, food and pharmaceutical products, as well as in hospitals, homes and vehicles.
context_section_description: HEPA filters, as defined by the United States Department of Energy (DOE) standard adopted by most American industries, remove at least 99.97% of airborne particles 0.3 micrometers (μm) in diameter. The filter's minimal resistance to airflow, or pressure drop, is usually specified around 300 pascals (0.044 psi) at its nominal volumetric flow rate.
  The specification used in the European Union: European Standard EN 1822-1:2009, defines several classes of HEPA filters by their retention at the given most penetrating particle size (MPPS).  The averaged efficiency of the filter is called "overall", and the efficiency at a specific point is called "local":
  See also the different classes for air filters for comparison.
  Today, a HEPA filter rating is applicable to any highly efficient air filter that can attain the same filter efficiency performance standards as a minimum and is equivalent to the more recent National Institute for Occupational Safety and Health N100 rating for respirator filters. The United States Department of Energy (DOE) has specific requirements for HEPA filters in DOE-regulated applications.
caption: A portable HEPA filtration unit used to clean air after a fire, or during manufacturing processes.
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