HEPA filter is the main filter used in most air purifiers. It is mainly used to filter small molecular particles dust and various suspended solids with a diameter of more than 0.3μm. The price gap of HEPA filters in the market is very large. In addition to the pricing factors of the products themselves, there is a certain relationship with the level of HEPA filters.
HEPA filters and the like are subdivided into G1-G4, F5-F9, H10-H14 and U15-U17 according to the current European scale. The most common type of air purifier is the H grade, which is an efficient or sub-efficient filter. The H13 is recognized as the best H13-14 filter. The HEPA filter of H13 grade can achieve a total efficiency of 99.95%. The total efficiency of the H14 grade HEPA filter can reach 99.995%.
Of course, the highest purification level of the HEPA filter in the European standard is U grade, and the best U-17 grade HEPA filter has a total purification efficiency of 99.999997%. However, because the U-grade HEPA filter is expensive to manufacture, it is very demanding in the production environment. So there are not many applications on the market.
In addition to the purification grade, the HEPA filter has a fire rating. The market divides it into three grades according to its degree of fire resistance: the primary HEPA mesh, all materials of the HEPA mesh are non-combustible, and the non-combustible materials should conform to GB8624- 1997 Class A; secondary HEPA network, HEPA mesh filter material should be incompatible with GB8624-1997 Class A non-combustible materials, partition plate, frame can be used in accordance with GB8624-1997 B2 class flammable materials. For the three-level HEPA network, all materials of the HEPA network can be used in accordance with GB8624-1997 B3 grade materials.
In addition to grades, HEPA filters come in different materials. The most common materials are five types: PP filter paper, composite PET filter paper, meltblown polyester nonwoven fabric and meltblown glass fiber. The five different types of HEPA filter networks have their own advantages and disadvantages, and the main application fields are also different. The HEPA filter material of PP filter paper is widely used in air purifiers because of its acid and alkali resistance, corrosion resistance, high melting point, stable performance, non-toxicity, odorless, uniform distribution, low resistance, high efficiency and environmental protection.
Finally, let’s talk about the HEPA mesh filter competitor on the air purifier – a HEPA composite filter constructed by HEPA dust filter cotton with coconut shell activated carbon and activated carbon fiber composite. Air purification using this type of filter The device is better than the HEPA filter air purifier in terms of the type of purification and purification efficiency. Therefore, more and more consumers have begun to abandon the HEPA filter and instead choose a composite filter air purifier.
Post time: Jan-05-2017