空气净化器的选购注意事项。
Notices for purchasing air purifier.
一要看CADR值，CADR越高，净化效率越快；二要检查CCM值，CCM与CADR两项指标是评判空气净化器性能的最大依据；三要看空气净化器的净化能效，其表示的是产品耗电水平，数值达到2时为合格，达到5时为高效；最后，为确保质量起见，要选购大品牌的空气净化器
Firstly, the higher the CADR value, the faster the purification efficiency; secondly, check the CCM value, CCM and CADR are the most important criteria for evaluating the performance of air purifier; thirdly, look at the purification energy efficiency of air purifier, which shows the level of power consumption of products, when the value reaches 2, it is qualified, and when it reaches 5, it is efficient; lastly, in order to ensure the quality of air purifier. See, we need to buy big brand air purifier