The QuietClean compact tower air purifier offers superior air cleaning power with permanent filtration. The high efficiency permanent filter removes up to 99% of airborne particles such as dust pollen smoke and pet dander returning cleaner fresher air to your room. Compared to full size ionic air purifiers the filter from the HFD-010 captures over 6 times more pollutants . A powerful but quiet fan pulls air into the unit circulating and filtering the air in your room up to 5 times each hour. The permanent filter is easily rinsed clean in water requiring little maintenance and no expensive replacement filter costs. The sleek compact tower design takes up little space and can be used virtually anywhere - tabletops counters floor or nightstand. This model is most effective in small size rooms up to 62 sq. ft.