This allergen remover uses true Hepa filtration, which is up to 99.97-percent efficient in removing allergens such as pollen, dust, mold, pet dander and smoke from the air passing through it. Unit features 3 speed settings, optional ionizer, and slim tower design. Recommended for rooms up to 150-square-feet; smoke CADR 100. Replacement filter: HAPF300D-U2.