How to select a good air purifier

How to select a good air purifier , we can make overall consideration from the four points ， 

1. CADR (Clean Air Delivery Rate) , is a value used for evaluating the purification efficiency of the purifier. The higher CADR value, the higher purification efficiency, which means purify more air in the same time ,and in a fixed space complete purification with a faster speed.

2, CCM, which means the cumulative purification capacity. In layman's terms, it is the service life of the filter element. The higher CCM value, the longer service life. 

3, Energy Efficiency, it depends on whether you save money or not. The same amount of clean air, obviously the less power consumption is better.4.

4, Noise output, which depending on the design and manufacturing process . What is noise ？ The sounds which let us feel uncomfortable . When noise adversely affects people and the surrounding environment, noise pollution is formed.Noise can not only cause damage to hearing, but also induce a variety of carcinogenic and fatal diseases, and also interfere with people's lives and work.