Dewrable Air Purifier Filter, Pre-Filter + True HEPA 13 Filter + Activated carbon Filter | Double-layer high-efficiency & Composite Filter Air Purifier Filter  (HEPA Filter)

Pre-filter: It can prevent large particles in the air, such as hair, dandruff, coarse particulate matter and coarse dust. HEPA & Activated Carbon Combined Filter: The high efficient HEPA mixed active carbon filter could remove dust and particles with diameter of 0.01 micron professionally, it also has the function of adsorbing and catalyzing pollutants in the air.