Authoritative person to interpret the air purifier

The main performance test results of air purifiers released in China recently announced that the "formaldehyde removal function" of air purifiers is basically ineffective. According to this authoritative source, this news is misunderstood by some media. Not all air purifiers are ineffective in addition to formaldehyde.

Recently, the National Indoor Vehicle Environment and Environmental Products Quality Supervision and Inspection Center has released the results of evaluation of the main performance of air purifiers in China for the first time, claiming that the "formaldehyde removal function" of an air purifier is basically ineffective. The news caused an uproar, and the director of the National Indoor Environment and Environmental Products Quality Supervision and Inspection Center Song Guangsheng said in an interview with an Economic Daily reporter that the news was "out of context" and was misunderstood by some media, not all air Purifiers have no effect except formaldehyde. Song Guangsheng said that in the evaluation, the quality inspection center selected 10 purifiers from an e-commerce platform in accordance with the sales volume of self-operated products, including 7 foreign brands and 3 domestic brands. After one month of testing, they obtained The first phase of the test results. "Three domestic brands do not have the function of removing formaldehyde itself, and seven foreign brands are marked with the function of formaldehyde, but the evaluation shows that the function is very weak." Song Guangsheng said that developed countries have less formaldehyde pollution, and even if there is formaldehyde pollution in the indoor, the proportion and concentration It is also relatively small, so many imported products claim that "such as the formaldehyde reduction rate of 97.3%" has exaggerated propaganda suspected.

Chen Yusheng, general manager of the independent brand division of Leike Electric Co., Ltd., said in an interview with reporters that the difference in the amount of formaldehyde detected by clean air in different domestic laboratories is quite different. “Formaldehyde is different from particulate pollutants, The tightness requirements of the cabin are very high, and the tightness of the test chambers of different laboratories is very different. Some chambers have leaks of more than 10%. Therefore, the test value of formaldehyde varies greatly. The CADR value of formaldehyde is rarely marked in the industry.

In addition to particulate matter, in addition to gaseous pollutants, sterilization and disinfection are the three major functions of air purifiers. The general air purifier is generally the first layer of a coarse net, which mainly filters hair, large dust, etc.; the second layer is a catalytic net, mainly to remove formaldehyde; the third layer is also a net to remove gaseous pollutants, adsorption is similar For gaseous contaminants such as formaldehyde and toluene; the last layer is a highly efficient HEPA network, which removes fine particles such as PM2.5. If the new house wants to remove formaldehyde, Song Guangsheng suggests that ventilation is a better approach. If you purchase a dedicated air purifier, “do not just look at the advertisements beautifully, but also carefully check the indicator data.” Chen Xiaosheng reminded, look at the formaldehyde The removal efficiency should not be judged as whether it is 97% or 99%. It depends on the test method: the general national standard is to use 30 cubic meters of space for test cabins, and some companies claim that 99.9% are experiments done in 1 cubic meter of test cabins; Secondly, depending on the test time, the same results as the 24-hour test and the 4-hour test will certainly be better for a 4-hour empty net facility. If the manufacturer provides a test report of formaldehyde, it depends on whether the natural decay of formaldehyde is mentioned in the report. If the natural attenuation of the test is too large, then the actual effect of removing 99% of formaldehyde will be relatively poor.