HEPA filter Factory Test Standard
EN1822:2019 & ISO 29463

EN 1822 and ISO 29463 HEPA filter factory test

Created Monday, 19 April 2021

Not all HEPA filters are created equal. Only by using the EN1822:2019 and ISO 29463 test standards can end users really identify whether a HEPA filter has been manufactured and designed to fit the clean air requirements of their workplace. The EN1822 standard has had many iterations dating back to its original inception in the 1990s. In the latest iteration of this standard, the test procedure for ISO 29463 has been included to ensure global acceptance of the test. Whether the HEPA filter is used for controlled environments like cleanrooms or as part of a system upgrade in a HVAC system or in a standalone air cleaner, you should always check that the filter has been individually certified to these standards. 

How hepa filters are tested

A HEPA filter is defined by its effectiveness at removing airborne contaminants from the air stream. EN1822:2019 is a factory test that helps to guarantee that the filter meets the removal efficiency needed. During factory tests of the HEPA filter, a test aerosol is used to measure the levels of airborne particulates that bypass the filter. Each HEPA filter is measured against the MPPS (most penetrating particle size) to ensure its effectiveness against even the smallest airborne contaminants. The MPPS of a filter ranges from 0.1 to- 0.2 microns. This means that when a HEPA filter is rated H14, it is 99.995% effective against the MPPS. When measured against other particulate ranges, it is often much more effective. At Camfil, we scan-test 100% of our HEPA filters utilising our lab capabilities. 

Understanding Efficiencies and Certificates