![Classes of HEPA-and ULPA-Type Filters Defined by EN 1822:1998 Filter... | Download Scientific Diagram Classes of HEPA-and ULPA-Type Filters Defined by EN 1822:1998 Filter... | Download Scientific Diagram](https://www.researchgate.net/publication/239697034/figure/tbl2/AS:754811335090176@1556972454082/Classes-of-HEPA-and-ULPA-Type-Filters-Defined-by-EN-18221998-Filter-Class-Overall-Value.png)
Classes of HEPA-and ULPA-Type Filters Defined by EN 1822:1998 Filter... | Download Scientific Diagram
![DIN EN 1822-1:2011 - High efficiency air filters (EPA, HEPA and ULPA) - Part 1: Classification, performance testing, marking; German version EN 1822 -1:2009 DIN EN 1822-1:2011 - High efficiency air filters (EPA, HEPA and ULPA) - Part 1: Classification, performance testing, marking; German version EN 1822 -1:2009](https://webstore.ansi.org/cover-pages/small/DIN/1739891.jpg)
DIN EN 1822-1:2011 - High efficiency air filters (EPA, HEPA and ULPA) - Part 1: Classification, performance testing, marking; German version EN 1822 -1:2009
![BS EN 1822-3:2009 - High efficiency air filters (EPA, HEPA and ULPA). Testing flat sheet filter media (British Standard) BS EN 1822-3:2009 - High efficiency air filters (EPA, HEPA and ULPA). Testing flat sheet filter media (British Standard)](https://webstore.ansi.org/cover-pages/small/BSI/30176849.jpg)