In the air filtration industry, there are numerous standards for classifying, identifying, and evaluating the various performance characteristics of air filters.

In the United States, the organization responsible for setting these standards is ASHRAE. Since 1968, ASHRAE has released a series of test standards for air filters, which have been recognized by the American National Standards Institute (ANSI) as the benchmark for filter performance classification.

In Europe, reference was made to ASHRAE standards, and CEN formally released the European filter standard EN 779 in 2012. In 2012, EN779 was revised for the second time, and the new standard defined the minimum filtration efficiency (ME) for F7-F9 efficiency filters, thus ensuring better air quality at the AHU outlet.


H13 HEPA,0.3μm particles Purification efficiency>99.95% F9 Medium effect filter, 1μmparticles Purification efficiency>95% G4 Coarse filter, 10μm particles Purification efficiency>90%


At the same time, to support the selection of energy-efficient air filters, EUROVENT (the European Association of Manufacturers of Refrigeration, Air Conditioning and Heat Pumping Equipment) developed the "Eurovent 4/11" guidelines in 2012 and upgraded it in 2015. The guideline is based on the EN 779:2012 standard for energy consumption calculation and is classified according to energy consumption. This tool enables us to select high-efficiency filters based on the standard and ensure lower energy consumption, providing the best solution for users.

In 2016, the ISO 16890 standard was introduced, providing the possibility of global standardization in the air filtration industry and replacing the existing two regional standards: ASHRAE 52.2 and EN779:2012.