Holmes Group HAP9414-UA HEPA-Type Air Purifier with Allergen Remover Filter HEPA-type filter helps remove up to 99% of airborne particles Optional ionizer assists in particle removal 3 speed settings to keep air fresh and pure Filter check indicator True HEPA filtration removes up to 99.97% of airborne allergens Ideal for those who suffer from allergies Captures allergens and pollutants: pollens, dust, dust mite debris, mold, pet dander, and smoke Compatible with aer1 ready air purifiers