The inner core of the popular air purifier – HEPA filter

The inner core of the popular air purifier – HEPA filter

Today, air purifiers are classified into active adsorption and passive adsorption according to the purification method. Active adsorption is mainly a negative ion air purifier, while passive adsorption is a filter air purifier. The purification methods of the two do not understand, but the ultimate goal is always. The core component of the filter air purifier is the filter screen. The filter of different materials purifies and intercepts the harmful substances of the air. However, the most effective HEPA filter is not only the purification effect but the service life is longer than the other. It is the best choice for dealing with smog. Many friends who know HEPA know, but do you know? HEPA filters are also different, they are also graded. In addition, is the HEPA filter really thicker and finer? Is it anxious? In the next article, I will tell you the answer.
What is HEPA?

The HEPA filter is made of very fine organic fibers. It has a strong ability to capture particles, has a small pore size, large adsorption capacity, high purification efficiency, and water absorption. The purification rate of particles for 0.3 micron reaches 99.97%. Therefore, its effect on filtering particulate matter is very obvious. If it is used to filter cigarettes, the filtration effect can reach almost 100% because the particles in the cigarettes are between 0.5 and 2 microns and cannot pass through the HEPA filter.
HEPA also has grades
The HEPA filter is divided into E10 to U17 and other grades. For fine particles with a diameter of 0.3 microns or more, the filtration efficiency ranges from 99.7% to 99.9999%. Among them, EPA10-EPA12 is called a sub-efficient air filter for filtering particulate matter; HEPA13-14 is called a high-efficiency air filter. ULPA 15-17 is known as an air filter with very low transmission.
The HEPA filter of H13 grade can achieve a total efficiency of 99.95. The H14 graded HEPA filter has a total efficiency of 99.995%. The U-grade HEPA filter has higher overall efficiency and can reach up to 99.999995 U17.
HEPA also has limitations
Although in theory, the HEPA filter is capable of intercepting tiny particles, if the humidity rises in reality, many bacteria and viruses are blocked on the filter net, but cannot be killed, but instead, breed on it and spread again in the air. On the other hand, there are many types of indoor pollutants, which determines that the air purifier needs to use a multi-layer filter to purify different pollutants.

The denser the filter air purifier filter, the better?
Many friends will think that the filter material used in the filter air purifier has a higher material density, and the better the effect of filtering the pollutants. However, is the truth of the truth really the same? The general ventilation filter in the purifier, the airflow wear The speed of the filter material is in the range of 0.13~1.0m/s. The resistance and the air volume are no longer linear, but an upward arc. The air volume increases by 30% and the resistance may increase by 50%. The filter can capture any form. Particulate matter, including droplets. The filter material is generally porous and somewhat anechoic. The filter creates resistance to the airflow and has some current sharing. The smaller the density of the filter, the smaller the diameter of the dust particles, the better the purification effect, but the strong resistance will be generated, the wind speed will be reduced, and the purification efficiency will be affected. Therefore, the purification by the filter alone has certain limitations (need to be increased). Fan power, but the noise is easy to exceed the standard, energy consumption, and high-efficiency filter network should be replaced frequently consumables). The reason is very similar to the fact that we wear masks. The masks that can effectively protect PM2.5 are often very airtight.

Olansi air purifiers mainly use HEPA filter air purifiers, and the quality and purification effect is among the best. Recently, a new air purifier has been combined with negative ions and filters to take advantage of each other to purify indoor air.

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