How to choose the air purifier?

China is called celestial because it is not windy when we automatically open the mode of heaven and earth, want to live in this silent Ridge does not need to hide in the church but need to buy an air purifier. To this background, in recent years, whether the traditional home appliances manufacturers or new-jin Internet enterprises, we all see the opportunity to launch their own air purifiers. Millet also launched its own air purifier this week, as it is a controversial issue on the internet that resembles the one in Bali. Here we do not play people to pick up, today small make up with your chatter with the face of the air purifier, how we should choose. Photo: What kinds of formaldehyde air purifier? From the principle of work can be divided into physical filtration, electrostatic adsorption and mixing class. Physical filtration is the use of fans to drive the filter to absorb the harmful substances in the air. The advantage is not to produce two times pollution, the disadvantage is that the need to regularly replace the filter, noise is also relatively large. Electrostatic adsorption by definition is the use of high voltage electrostatic principle, the use of electrostatic absorption of dust particles in the air, the advantage is that the filter does not need to be regularly replaced, relatively quiet. Shortcomings in addition to the inability to purify formaldehyde and other harmful gases, produce ozone caused two pollution more important is that you need to wash regularly. Mixing is the existing filter network and electrostatic device. The current market is the mainstream air purifier for physical filtration class, this article also mainly discusses the selection of filter-type air purifier assessment indicators. What is the Cadr value? Can I have it? CADR is the abbreviation for Clean Air IBuySpy rate, which is the standard of the American Household Appliance Manufacturers Association (AHAM) to pass complex calculations according to strict test standards. Simple to understand the cadr= single filter Efficiency x outlet air volume, and air volume = outlet area x wind speed. The greater the CADR value, the higher the purification efficiency of the purifier. It is worth mentioning that there is no mandatory standard for air purifiers at present, so many manufacturers will be able to swap the concept, for example, some businesses directly to the fan maximum air volume to mark rather than the maximum air volume. Because of the wind resistance and air duct loss factors, the air volume will be less than the maximum air volume. According to the Aham standard, the actual Cadr value divided by 11 is the usable area. But since this is the United States standard, and the United States Air quality and China is not at all a level, so in our country this ratio should be greater than 11. But one thing is no problem, that is, the CADR value is positively correlated with the usable area. Figure: HEPA filter Screen How to choose? Most of the filter is composed of HEPA filter and activated carbon filter, HEPA is mainly used for purifying dust, PM2.5 and other solid pollutants, and activated carbon filter is mainly used to adsorb formaldehyde, odor and other volatile gases. However, attention should be paid to the network has a fixed service life, saturated with pollutants overflow. Screen selection should also be based on the actual use of the demand. For example, for the newly decorated house to buy air purifier should choose the relatively more activated carbon screen. However, the high activated carbon will also hinder the intake air intake, the specific principle is to see the CADR value. MeshThe cost of use should also be considered, the use of the screen is not only the price of a single screen, but should be the price of the screen divided by the filter service life. Noise is also important! The purpose of air purifier is to reduce pollution, and noise itself is a kind of pollution. The main source of noise from air purifiers is the blower. Especially when you sleep at night, the noise may not be there but it does make you mad. Also note that even if you do not open the air purifier at night will also have a certain decibel noise, and many businesses to mark the minimum noise value is measured in the Anechoic laboratory, put into the actual use of the other noise will be larger, for reference only. There are some purifier, normal mode or night mode noise is really very low, but all switch to high-power mode is simply to take off ... There are some pieces apart from the above points, sensor sensitivity is also an important indicator. As for the price and appearance of air purifiers This is the view of the beholder. (Big Can)