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%.
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)
Classification