Nylon Mesh F9 HEPA Filter Ventilation Filter With 220 Initial Resistance

Activated carbon type
The activated carbon medium for acidic gas removal consists of chemically modified carbon, suitable for acidic and corrosive environments.it effectively removes about 90% of pollutant gases,including sulfuric acid, sulfur dioxide,and volatile organic compounds (VOCs).The activated carbon medium for alkaline gas removal effectively eliminates ammonia gas, removing about 90% of pollutant gases.The filter medium reacts with pollutant gases to form inorganic salts,which are not easily resolved. The adsorption reaction mechanism is immediate, safe, and permanent.
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.

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.