Honeywell HHT081 HEPAClean Tower Air Purifier With Permanent Filter Clean your air without having to worry about expensive replacement filter costs. The Honeywell Permanent HEPA Tower Air Purifier offers effective air cleaning with permanent filtration and little maintenance. The permanent HEPAType filter is certified 95 effective at capturing airborne particles such as dust, pollen, tobacco, smoke, cat dander, and mold spores. A washable prefilter captures large particles. The air purifier operates quietly while changing the air in the room up to every 12 minutes. For extra air freshening, there's an ionizer which can be turned on or off as desired.