Replacement FilterFiltrete air cleaning filters snap easily into place. Replace filter every three months for maximum performance. Captures allergens like dust, smoke, smog, mold spores and pet dander from the air passing through the filter. Built-in activated carbon filter helps reduce odors. Filter Type: Activated Carbon Filter; Filtration Type: Activated Carbon Filter; Filtration For: Dust;Mold Spores;Odors;Pet Dander;Pollen;Smog Particles;Smoke.