FEATURES- QuietFlo 730 Tower HEPA Small/Medium Air Purifier QuietFl 99.97% Effective to 0.3 Microns Changes the Air up to 6 Times Per Hour 30% Better Odor Reduction Separate Ionizer Enhances Air Cleaning and Freshens Air Mechanical Controls LED Filter Change Indicator 3-Speed Whisper-Quiet Hunter Fan 5-Year Limited Warranty * Room sizes up to 11 ft. x 14 ft. * CADR: Smoke - 95 Dust - 95 Pollen- 100 * Model 30962 Replacement Filter * Model 30901 Pre-Filter * NOTE- 99.97% effective at removing particles as small as 0.3 Microns that pass through the filter. Overall airborne particle retention in any environment depends upon a number of factors including the amount of air processed, the particle type, and the rate of particle introduction into the environment.