How to understand the key indicator CADR of air purifiers?

　　However, it is useless to put the filter or activated carbon alone there. In order for these filtering methods to work, the indoor air needs to be continuously passed through the filter or activated carbon. This means that in order to measure the purification ability of a purifier, one cannot simply look at how powerful the filter or activated carbon is, but should look at the performance of the whole machine.

　　The performance of this whole machine is CADR. The full name of CADR is clean air output rate. What is this concept?

　　Simple understanding, a purifier can be abstracted into a hole suspended in the air, this hole sucks in the same amount of indoor air containing pollutants, and blows out absolutely clean air that is equal to the CADR value and does not contain impurities [1]. As shown in the figure below, the box in the middle sucks in contaminated air from below and blows clean air to the top.

　　In the actual test, the CADR determination is also in a standard test environment, the purifier is continuously turned on, and the pollutant concentration in the test chamber is continuously recorded, and the curve is used to fit the value of the ideal model to infer the purification. The CADR value corresponding to the device. Therefore, the CADR value is a more direct and effective measure than a single efficiency or air volume.

　　[1] "Blowing out absolutely clean and impurity-free air equal to the CADR value" does not mean that the air processed by the air purifier is "absolutely clean", it is just a number to measure the effect. Because the CADR value is not a test of how much air the purifier can blow, but the role of the purifier and the size of the absolute clean air outlet equivalent

　　[2] According to the new national standard GB/T32610-2016, when the human head model is actually worn, the A-level mask can reduce the concentration of oily particles such as sodium chloride particles and paraffin oil by at least 90%, which is the highest level of protection in the national standard. Masks. Note that the human head model is different from the rating of industrial masks for filter material grades. It simulates the actual situation that cannot absolutely fit the face shape in actual use, and measures the protective effect that meets the actual use scene.

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