Fine dust purification characteristics of air cleaners

According to the test method for clean air delivery rate of particulate matter in GB/T 18801-2015 Air cleaner, simultaneously tests the count concentration and mass concentration of particulate matter in a test cabin by electrometric low pressure impact (ELPI) system, and studies the purification characteristics of PM10, PM2.5, PM1.0 in four filter air cleaners. The results show that the count concentration attenuation constants of PM10, PM2.5 and PM1.0 are the same, and the mass concentration attenuation constants gradually decrease. For the same air cleaner, the total attenuation constant of count concentration of PM10, PM2.5 and PM1.0 is slightly lower than that of mass concentration, the smaller the particle size of the fine dust is, the harder it is to be removed by the air cleaner.