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Standard-HEPA Filter Standard ISO 29463 VS EN 1822

Views: 0     Author: Site Editor     Publish Time: 2021-11-05      Origin: Site


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ISO 29463 originates from EN1822, which defines EPA, HEPA and ULPA filters commonly used in industry. While ISO 29463 maintains the classification of EPA, HEPA and ULPA.But replace E10-E12, H13-H14 and U15-U17 with the following 13 filter levels:


ISO 29463 classification

EPA   filter

ISO 15 E-ISO 30 E

HEPA filter

ISO   35H-ISO 45 H

ULPA filter

ISO   50 U - ISO 75 U

The ISO 29463 can't replace EN 1822, EN 1822 will continue to be valid.

In October, 2011, the International Organization for Standardization (ISO) issued ISO 29463 Part 1-5, aiming at accelerating the unification of various filter standards used in the United States and Europe. From then on, ISO 29463 and EN1822 coexist in the United States.

However, in Europe, the revised version of EN 1822-1 "Classification, Performance Testing, Marking" continues to exist, but the revised standard will refer to Part 2-5 of ISO 29463. Simply put, EN 1822 will have its own air filter classification system (Part 1), but it will be tested according to Part 2-5 of ISO 29463.

There are differences between the test methods of leakage in the two standards. Part 1 of ISO 29463:2017 specifies five methods, while part 1 of EN 1822 only has three.

ISO 29463 part 1

EN 1822 part 1

Scanning leak test

Scanning leak test

Oil leakage test

Oil leakage test

Efficiency test
  Applicable to 0.3m to   0.5m.

Efficiency test
  Applicable to 0.3m to   0.5m.

Aerosol photometer leak test

PSL leak test

Part 1 of EN 1822 is more stringent than ISO 29463 in the requirement of air filter leakage test. EN1822 explicitly excludes the use of aerosol photometer. Regarding the permissibility of PSL leak test, this standard is still unclear. Paragraph 7.3 of Part 1 states: "Possible aerosol substances include but are not limited to DEHS,PAO and PSL". However, the test program using PSL is seldom used because of its high cost.

As mentioned above, ISO 29463 maintains the classification of EPA, HEPA and ULPA filters in EN 1822. The evaluation in the new ISO standard is also based on the particle capture rate under MPPS (the most penetrable particle size).

However, there is still a difference in the classification of filters between the two standards. If a filter is tested according to EN 1822, its filtering efficiency under MPPS is 99.9993%, it should be judged as H14 grade. However, when evaluated according to ISO 29463, the filter should be classified as ISO 50U grade of ULPA filter.

In addition, the grouping of air filters in ISO 29463 starts with ISO 15E, and the filter level is equivalent to E11 level of EN 1822. Therefore, ISO 29463 does not cover EPA filter class E10 level. In contrast, the test standard ISO 16890 has a filter level of ISO ePM1> 95%, which is equivalent to the filter level E10.

The following is a comparison between the filter categories defined in ISO 29463 and EN 1822:

EN   1822

ISO   29463

Overall   filtration efficiency

Local filtration efficiency



≥ 85%



ISO 15 E

≥ 95%



≥ 99%




≥ 99.5%



≥ 99.90%













ISO 50 U




ISO 55 U







ISO 65 U







ISO 75 U



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