Expert answers to teach you how to choose the right air purifier

Today's guests:

About smog and PM2.5

As the name implies, fog is composed of fog and haze, and the fog is better understood as the water vapor/water droplets in the air near the ground. However, it is not the same, but the dust in the air, sulfuric acid, nitric acid and other particles are saturated in the mist of the air. PM2.5 specifically refers to particles that are less than 2.5 microns in diameter in aerodynamics. PM2.5 is only a small part of the air. When he becomes more, it will affect visibility and air quality. PM2.5 has small particle size, large area, and strong activity. When it stays in the atmosphere for too long, it will cause people's health damage.

Ma: Now the smog is a lot of particles. For example, exhaust emissions from cars can cause particles, including a literature that China's cooking habits lead to smog in China. This is not a complete nonsense. Regarding the haze, we hope that everyone can attach importance to it. Do not think that there are still some haze and harmless topics on the Internet. Including the emphasis on PM2.5. In fact, all particulate matter, as long as the ingredients harm us, whether it is heavy metals or various Chemical components are all hazardous, and PM2.5 cannot be valued without paying attention to other particulate matter.

Lu: I talk about the indoor air. According to the air inside the national standard, the air is divided into four parts. The first is temperature and humidity. The other is chemical pollutants, including solid particles and organic compounds. The third is microbes. The fourth is It is nuclear radiation, which constitutes the overall quality of our indoor air. In fact, this haze is a carrier, we are collectively referred to as solid particles. Therefore, our air purifier currently solves two problems. One problem is solid particles, and then there are organic compounds, including formaldehyde and ammonia.

Secretary: When I talked about the complexity of the haze, I read a paper that talks about the problem of secondary particles. It is actually a problem of sulfur dioxide and nitrogen oxides. They produce some chemicals under photosynthesis. Purging this piece will bring greater challenges, and the danger is unknown.

How to set air purifier cleanliness standards

Lu: We first need to regulate the market, then show the quality of our products, and guide the consumers to purchase properly. The air purifier has the following standards according to national standards. Why do we think that such measurements on the purifier body will not be accurate? It is because the impact of wind speed is very, very large, it will cause its number ups and downs. Especially when shifting gears, you will find that the wind may be larger, which is actually the change caused by the air flow. But to be honest, this thing is no problem for qualitative instructions.

The first is electrical safety. Products that are not safe enough are definitely not listed. Next is the health and hygiene standard, which requires sterilizers to have sterilizing and antibacterial functions. There is also a performance standard, such as the CADR value we are talking about. The CADR value is the amount of clean air that can clean the cubic meters of air in an hour. Then we must consider the CCM, the amount of accumulated purification, this should be said to be the life of the filter. Energy efficiency is also a need to consider. As a whole, we are advocating energy conservation and power saving. The last point is noise. Actually, everyone is better than domestic ones (purifiers) or foreign ones (purifiers). Products have their own characteristics, but noise is a good thing for domestic products.

How to choose an air purifier

Ma: I don't want everybody to say let me recommend the purifier directly and say which one you recommend to me to buy. It's better to give me several dimensions. The first one tells me a price range and the price of different air purifiers. It is very different. The second one is that I hope everyone will tell me that you are using the area. This is too important. In fact, there is no need to buy anything particularly large as long as it can be reduced to a certain level of air purification at a reasonable time. The third point I hope he can give me a purpose. For example, I am a milk dad. The dimensions that I consider are slightly different. Everyone may only choose the pure performance when purchasing, but when you really use it, you will find that the problems you didn't consider when you buy will affect you a lot. For example, when changing the filter, this indicator will not prompt you. Another Lu has said that there are many kinds of indoor pollutants, everyone is afraid of haze, but the air quality in the cities of the south is very good, the most important thing is to go to formaldehyde, the filter is different for different things Set up. Including remote control, many products have built-in such features. Therefore, the dimensions are very large, so I hope that everyone can best describe your application scenario. In these dimensions, everyone should give me more clarity and I can choose this machine for everyone.

PM2.5 monitoring

Secretary: Why do we think that such measurements on the purifier will not be accurate? It is because the impact of wind speed is very, very large, it will cause its number ups and downs. Especially when shifting gears, you will find that the wind may be larger, which is actually the change caused by the air flow. But to be honest, this thing is no problem for qualitative instructions.

Replace filter and secondary pollution

Lu: I just said that PM2.5 will not come out on the filter, and if it comes out, it will not be purified. As we look at the machine is generally two ways, one is the blow, the other is the exhaust, the key two air purifiers is the level of the fan. Fans are not the same, the price is much worse. First of all, attenuation, purification efficiency is attenuated, and it can be used when the initial purification efficiency is 50%. However, at this time, it is recommended that you change it. We measure this point to 50%.

The problem of secondary pollution, it is not only particulate pollution, there are chemical pollutants, also see that there is ozone pollution, this we do not have to worry about, the safety standard of the national standard is electrical safety, in the market to sell Through this test, this is assured.

At the same time, I proved to the air purifier that the countries that actually use the most air purifiers are countries with good air, such as the United States, Japan, and Switzerland. Their penetration rate is 40%, we are about 3%, and Korea is the highest Up to 70%.

About the fresh air system

Ma: The fresh air and the air purifier are not in contradiction. The fresh air system is to take the outdoor air through filtration to the indoor lawsuit. The air purifier purifies the indoor air. Therefore, for the time being, I hope that if new houses are installed, if the economic strength is too high, the floors will be high enough to be installed during the renovation. Now if you choose a purifier, there is no need to change the fresh air.

Lu: In fact, the fresh air system is a development trend. It should be said that it is also an air purifier. The new air system is actually a mature system. Some of our earliest industrial purification plants and laboratories have adopted fresh air, but the home is still in a relatively elementary stage. You can use fresh air when you just bought a house, but you must consider the choice and maintenance costs.

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