EN1822 is a standard that defines the extent to which a filter removes particles from the air, both in terms of the size of the particles and the amount effectively removed. The standards are divided into different classes based on the particle size the filter can stop. The main classifications are:
Test method: The EN1822 standard defines detailed test procedures for measuring the efficiency of a filter. This is usually done by exposing the filter to a aerosol of a specific size and concentration, and measuring the degree of particle removal on the other side of the filter.
Filter durability and contamination: The standard also provides guidelines for testing the durability of filters in real-world conditions. Filters can foul over time, which can affect their performance. It is important to understand how a filter performs over time so that maintenance or replacements can be carried out in a timely manner.
Integrity testing: The EN1822 standard requires the integrity of a filter to be tested regularly to ensure that there are no leaks that could reduce performance. This is usually done using a so-called leakage test where controlled amounts of particles are passed through the filter to test for any bypass or defects.
Applications: The standard is widely used in environments where air purity is vital. These include cleanrooms in the pharmaceutical industry, medical facilities, hospitals and laboratories, where sterile conditions are essential for patient health and safety and research.
Filter class | Integral value | Penetration (%) | Local value | Penetration (%) |
E10 | ≥ 85 | ≥15 | * | * |
E11 | ≥ 95 | ≥ 5 | * | * |
E12 | ≥ 99,5 | ≤ 0,5 | * | * |
H13 | ≥ 99,95 | ≤ 0,05 | ≥ 99,75 | ≤ 0,25 |
H14 | ≥ 99,995 | ≤ 0,005 | ≥ 99,975 | ≤ 0,025 |
U15 | ≥ 99,9995 | ≤ 0,0005 | ≥ 99,9975 | ≤ 0,0025 |
U16 | ≥ 99,99995 | ≤ 0,00005 | ≥ 99,99975 | ≤ 0,00025 |
U17 | ≥ 99,999995 | ≤ 0,000005 | ≥ 99,9999 | ≤ 0,0001 |
*Class E10-E12 do not undergo a local leakage test.
The EN1822 leakage test is a method used to assess the performance of EPA, HEPA and ULPA filters.
The primary purpose of the EN1822 leakage test is to determine whether the HEPA or ULPA filter is free of leaks and defects that could compromise its ability to filter suspended particles effectively. This test ensures that the filters meet the required standards for air purity and safety.
The leak testing procedure consists of several steps:
Conclusion:
The EN1822 leakage test is an essential procedure to ensure the integrity and efficiency of HEPA and ULPA filters. By using the right aerosol, equipment and techniques, this test ensures that air filtration systems meet the stringent standards required in environments where air purity is critical. It also serves as a valuable tool to maintain the longevity and effectiveness of filtration systems, protecting both product quality and public health.
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