Karcher AF20 Air PurifierAir purifier AF 20 Perfect air purification for small rooms, childrens rooms and individual workspaces the AF 20 air purifier cleans indoor air of allergens, pollutants and pathogens by means of its multi layer filter system. Other features include the active carbon fill, as well as a display to alphanumerically indicate the air quality in PM2. 5 particles in g m and the air quality via a colour code. The air purifier also makes an excellent choice on