Black & Decker HEPAFresh&trade; Air Cleaner BXAP148 3 Speed HEPA Purifier with Pre and Charcoal Filters Multi-layer HepaFresh filter captures up to 99% of common allergens including dust mites, mold spores, pollen and pet dander; Pre-filter layer captures large particles Carbon filter layer reduces household odors caused by pets, cooking and smoking 22" tower design is great for use in medium size rooms Ultra quiet when running making it easy to keep on while sleeping. 3 fan speeds to suit your home environment needs. Uses Black+Decker HEPAFresh replacement filter # BXFLTY or GermGuardian HEPA replacement filter # FLT4825. To lengthen the life of your filter, a 4 pack of the carbon filters is also available (model FLT22CB4).