For the HEPA and ULPA filters, classification was based on the Eurovent 4/4 standard,which defined 5 classes of filters: | EU 10,EU 11,EU 12,EU 13 and EU 14 |
In order to meet the demands of high technology,there is a need for new test methods and a new classification for absolute filters. In Germany,DIN lanuched the DIN 24183 standard project to test Hepa and Ulpa filters, based on the measurement of particles.As a basic test principle and classification system,CEN accepted. EN 1822.The European standard EN 1822 replaces sveral national standards such as DIN 24184,BS 3928 and AFNOR 44013. | Integral efficiency for MPPS | Class according to | | EN | DIN | DIN | BS | Mil.Std | | 1822 | 24183 | 24184 | 3928 | 292 |
| H-10 | EU-10 | Q | EU-10 | - |
| H-11 | EU-11 | R | EU-11 | >=99.5% |
| H-12 | EU-12 | - | EU-12 | >=99.97% |
| H-13 | EU-13 | S | EU-13 | >=99.99% |
| H-14 | EU-14 | - | EU-14 | >=99.999% |
| U-15 | EU-15 | - | - | - |
| U-16 | EU-16 | - | - | - |
| U-17 | EU-17 | - | - | - |
*The integral efficiency is the mean value of all local efficiencies measured over the filter's face area.
In the first stage of EN 1822 standard,an evaluation will be made of the fractional efficiency for the filtration measurements prepared at the same speed as in the filter.The aim is to determine the particle size that is offered the lowest retention efficiency by the media , which is called. | EN 1822 |
| MPPS INTEGRAL VALUE |
| MPPS LOCAL VALUE |
| | Filter | Filter | Efficiency | Penetration | Local Efficiency | Penetration | | Group | Class | % | % | % | % | | HEPA (H) | H-10 | 85 | 15 | - | - | | H-11 | 95 | 5 | - | - | | H-12 | 99.5 | 0.5 | 97.5 | 2.5 | | H-13 | 99.95 | 0.05 | 99.75 | 0.25 | | H-14 | 99.995 | 0.005 | 99.975 | 0.025 | | ULPA (U) | U-15 | 99.9995 | 0.0005 | 99.9975 | 0.0025 | | U-16 | 99.99995 | 0.00005 | 99.99975 | 0.00025 | | U-17 | 99.999995 | 0.000005 | 99.9999 | 0.0001 |
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