Product Detail Quiet operation - unit only reaches a maximum of 66 dB on its highest speed! Permanent split capacitor motor lasts for years and years! Filters only need to be changed once every five years! Pre-filters can be easily vacuumed from outside! Intakes 250 square feet of air per minute for maximum purification efficiency . The "Austin Air PetMachine HEPA Air Purifier With 4Stage Filtration" is best product for you. We recommended Austin Air PetMachine HEPA Air Purifier With 4Stage Filtration