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Depth analysis: Resist the smog How many levels does the HEPA filter have?
Consumers who have learned about air purifiers must know that the most important "de-smashing" parts of all filter-type air-cleaning products are HEPA filters, namely High Efficiency Particulate Air Filter. HEPA also has a grade. For example, LIFAair's new LA500 purifier has a HEPA rating of 12. Different levels of filter purification capacity have a direct impact on the purification capacity of PM2.5.
The higher the HEPA filter grade, the higher the purification efficiency
According to the latest version of the European standard EN1822-1:2009 "High efficiency air filter (EPA, HEPA and ULPA) Part 1: grading, performance test, identification" stipulates that the filter is divided into three groups E, H, U :
Purification efficiency (%)
The purification efficiency shown by the EU standard is not for PM2.5, but for particles with the most easily penetrated particle size (MPPS), ie particles with a diameter of 0.12 to 0.25 microns. At present, the air purifiers on the market use filter screens of 10 or higher, and the high-end models adopt 12 and 13 grades with higher purification efficiency. The higher the filter level, the higher the cost will be. The level can directly reflect the quality of the filter. For example, Iqair's pre-filter uses 11 grades to filter coarse particles, such as dust and pollen, to remove PM2. 5 or even smaller fine particles are the assembled 12/13 screen.
In the early versions of the EU standard, there were only two groups of H group (H10-H14) and U group (U15-U17). The current standard (2009 version) changed the filter level to E group (E10-E12), H group. (H13, H14) and U group. Although the level code has changed, the standard regulations for the corresponding purification efficiency have not changed. This is why "some vendors still call the filter they use H12."
HEPA filters of class 12 and above have become standard equipment for high-end purifiers.
For consumers, there is no need to be familiar with the standard boring regulations. As long as you know that the higher the level of HEPA, the higher the purification efficiency is enough.
Then, when we purchase the air purifier, if we consider the filter grade as a factor, we can better identify the performance of the purifier and buy a high-quality empty net product. According to market research, HEPA is currently standard for high-end purifiers in Class 12 and Class 13, and there is no HEPA filter for air purifiers above 13 levels.
The new national standard will become the most rational basis for consumers to buy.
China's air purifier national standard GB/T18801-2015 was released in September last year and officially implemented in March this year. At that time, the air purifiers sold in China should be strictly tested by our national standards.
The standard provides consumers with a number of indicators as a basis for purchase, such as clean air volume (CADR), cumulative purification (CCM), applicable area, purification energy efficiency, noise limit, and so on. The amount of clean air refers to the volume of air that can be purified every hour. The larger the value, the better the purification speed and the purification effect, which is closer to the actual level than the HEPA level. With CADR as the core, the applicable area obtained by pushing down is also the most intuitive. Optional parameters; at the same time, the cumulative purification amount reflects the service life of the filter material, the comparison of the same price products, the higher CCM value can reflect the higher cost performance of the product.
Taking LIFAair's LA500 air purifier as an example, after the authoritative testing by the China Household Electrical Appliances Research Institute, the CADR value of the particulate matter is as high as 450m3/h, and the CADR value of formaldehyde is as high as 137m3/h, and the CCM value for the above two pollutants. They are far above the top standards set by the new national standard. The H-12-class HEPA filter is also an important guarantee for the performance of “de-smashing”, which is worthy of consumers' purchase.