EN 1822 Normative. Absolute Filters (EPA, HEPA and ULPA)

Filter Classification

To HEPA and ULPA Filters, the classification is based on Eurovent 4/4 standard which defines 5 types of Filters: EU 10, EU 11, EU 12, EU 13 and EU 14.

In order to cope with the demands of high technology, there is a need for new testing methods and a new classification of absolute filters

DIN launched in Germany for HEPA and ULPA filters the project DIN 24183, based on particles measurements, CEN accepted as a basic principle system of testing and rating

EN 1822. European standard EN 1822, replaces several national standards such as DIN 24184, BS 3928 and AFNOR 44013.

INTEGRAL FOR EFFICIENCY * MPPS Class
EN 1822 DIN 24183 DIN 24184 BS 3928 Mil. Std.. 292
  E10 UE10 Q UE10 -
  E11 UE11 R UE11 > = 99,5%
  H12 UE12 - UE12 > = 99,97%
  H13 UE13 S UE13 > = 99,99%
  H14 UE14 - UE14 > = 99,999%
  U15 UE15 - -  
  U16 UE16 - -  
  U17 UE17 - -  

Comprehensive Efficiency is the average value of all local efficiencies in the front area of the filter

In the first stage of this standard EN 1822, the fractional yield for different filtering measures will be assessed at the same rate in the filter. The purpose is to determine the particle size for which the filter material offers the lowest retention efficiency, this size is called: Most Penetrating Particle Size (MPPS)

EN 1822 - Tamano de partícula de Penetración alcalde (MPPS)
 
 

The particle size is usually between 0.15 and 0.25

The next step is to know the collection efficiency of the filter for this MPPS

Depending on the performance, leakage and porosity are classified into two groups:

·         HEPA (High Efficiency Particulate Air): E10, E11, H12, H13 and H14

·         ULPA filters (Ultra Low Penetration Air)

·         The Venfilter process for conducting efficiency measurements is done by scanning

The leak test is done separately