HEPA/ULPA air filter3
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HEPA/ULPA air filter

Initial pressure drop, initial efficiency and filter classification for HEPA/ULPA filter

 Testing standards

Initial pressure drop

Initial efficiency

 EPA, HEPA and ULPA air filter testing standards

  EN 1822 (ISO 29463:2011) High efficiency air filters (EPA, HEPA and ULPA)

Part 1 : 2019 –  Classification, performance testing, marking

Part 2 : 2009 –  Aerosol production, measuring equipment, particle counting statistics

Part 3 : 2009 –  Testing flat sheet filter media

Part 4 : 2009 –  Determining leakage of filter element (Scan method)

Part 5 : 2009 –  Determining the efficiency of filter element


     IEST-RP-CC001.5 :2009 HEPA and ULPA Filters

     IEST-RP-CC007.2 :2007 Testing ULPA Filters

     IEST-RP-CC021.3 :2009 Testing HEPA and ULPA Filter Media

     IEST-RP-CC034.3 :2009 HEPA and ULPA Filter Leak Tests


EN 1822-3 filtration media 

   Measuring the initial efficiency at different particle size and obtain the minimum       efficiency at most penetration particle size (MPPS). The available maximum             filtration efficiency can be up to 99.99999%.

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Testing procedures of HEPA/ULPA air filter (EN 1822)

1. Determin the air flow rate or face velocity  

2. Calculate the effective area of filter media

3. Calculate the media velocity

4. Measure the initial efficiency at different particle size and obtain the minimum efficiency at most penetration particle size (MPPS)