Home & Office indoor air purifiers featuring activated carbon and HEPA At AllerAir we believe in making air purifiers and air cleaners that truly clean your air - not partially clean, but completely clean. That's why we believe that all indoor air purifiers need activated carbon in addition to high quality HEPA filters. Other air purifiers and air cleaners focus on filtering out particles, but AllerAir air purifiers featuring activated carbon go one step further and protect you from the harmful chemicals, gases and odors present in every home and office.