Air purifier performance evaluation shows that the removal of formaldehyde is basically invalid
Under the threat of smog weather, can the air purifier eliminate the effect of indoor PM2.5? On the 26th, the National Indoor Interior-Environment and Environmental Product Quality Supervision and Inspection Center released the main performance evaluation results of the air purifier for the first time. The PM2.5 removal rate of the mainstream brand air purifier was generally up to standard, but the function of removing formaldehyde was basically invalid.
The evaluation purchased 10 sets of best-selling brand purifiers from Suning’s electronic sales platform in accordance with the sales volume of self-operated products, including 7 foreign brands and three Chinese brands. After one month of testing, the indoor vehicle environment and environmental product quality supervision and inspection center found that the purification performance of the air purifier has nothing to do with the price.
“The best way to remove PM2.5 is the air purifier with a price below 1,000 yuan.” Song Guangsheng, director of the indoor environment and environmental product quality supervision and inspection center, analyzes the purification performance and product sales of air purifiers and whether they are foreign brands. There is no direct relationship.
Is it better to buy an air purifier with a higher clean air volume? Song Guangsheng reminded us that it is reasonable to choose according to the size of his room. The clean air volume is more than 100 cubic meters per hour. It is suitable for rooms of 15 to 20 square meters. It can reduce PM2.5 in indoor air by more than 90% after one hour of starting. The higher the amount of clean air per hour, the more suitable it is for large-area rooms. Consumers should choose the most suitable products according to the living conditions to avoid unnecessary waste.
Household air purifier products are mixed, some products do not give CADR values according to national standards (clean air per hour), but use “removal rate” to mislead consumers. Some consumers have spent a lot of money to buy back an air purifier with a nominal “removal rate” of 99.9% formaldehyde, which may actually be a “garbage” product.
Song Guangsheng explained that the “removal rate” is affected by factors such as test chamber volume, running time and natural attenuation, and it is difficult to reflect the true purification ability of the product. The removal rate is high and the purification ability is not necessarily strong. If the experimental conditions are not given, the “removal rate” is meaningless. For example, an air purifier that claims to have a special formaldehyde filter has a formaldehyde removal rate of 99.99%. At first glance, I thought the performance was extraordinary. Take a closer look at the instruction manual. The experimental conditions are in the 1 cubic meter test chamber. It is not practical to remove formaldehyde indoors. Therefore, consumers who use the “removal rate” to mark the air purification effect should be cautiously purchased.
From the test results, the purifier removes the PM2.5 technology in the indoor air is very mature, and the nine clean air volumes are more than 100 cubic meters per hour, which is effective for purifying the particulate matter in the indoor air. But solving chemical pollution in indoor environments is still a big problem for air purifiers.
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