Take the advantage of the adsorption capacity of the surface of the activated carbon adsorbent, the waste gas is in contact with the porous activated carbon adsorbent on the large surface.And the pollutants in the waste gas are adsorbed on the surface of the activated carbon. And the purified gas is discharged to the air. It can absorb formaldehyde, benzene, tvoc and other harmful gases and disinfection deodorization and other effects.