EN 1822 High Efficiency Air Filters (EPA, HEPA and ULPA)

The EN 1822 standard, a European standard, describes the classification, performance testing and marking criteria for ultra-low penetration (EPA, HEPA and ULPA) high and very high efficiency air filters used in the field of ventilation and air conditioning, as well as in technological processes such as clean room technology or pharmaceuticals.

Tests performed according to this standard use a test liquid aerosol or alternatively a solid aerosol, and a process for determining efficiency is established for the tests based on a method that counts particles. In this way, these filters are classified in a normalized manner based on their efficiency.

Sections 1822-2 of the EN 5 standard, which consists of five parts, were later repealed and replaced by the EN ISO 29463 standard.

The following test methods are offered in the EN 1822 standard:

• Evaluate the effectiveness of the filtration media. The number and size of particles retained by the filter are determined using a particle measuring device. By processing these data, the minimum particle size in the environment can be determined. This size is defined as MPPS, which stands for the smallest penetrating particle size.
• Checking for leaks from the filter element. With this test method, it is applied to collect data on the local efficiency that generates the aerosol, which will then be used to determine the overall efficiency. A probe that is moved across the entire surface of the filter is used during this test. This also allows the rate of leakage in a particular area of ​​the filter to be determined. The resulting value is defined as an integral value in calculating the total efficiency, while the leakage rate is defined as a local value.
• To determine the integral efficiency of the filtering element. In this test method, the pressure drop of the filter is first measured at an air volumetric flow rate corresponding to the nominal flow rate. The effectiveness of the filter on MPPS particles is then determined by an aerosol generator. According to this yield value, its class is determined by using the table in the atndarr.

EPA (efficient air filters), HEPA (high efficiency air filters) and ULPA (ultra low penetration air filters) are filter types used in ventilation and air conditioning and technical processes. These filters are classified and tested according to the EN 1822 standard, for example for applications in clean room technology or the pharmaceutical industry.

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