Honeywell HFD120Q HEPA Quiet Air Purifier Designed to purify air in small and mediumsize rooms up to 186 square feet, the Honeywell Tower air purifier offers twostage cleaning for healthier lungs and tidier rooms. The permanent, washable prefilter catches larger particles that'd otherwise clog the IFD filter for persistent smallparticle filtering and cleaner air. Best of all, the prefilter never needs to be replaced for easy, costfree maintenance. The purifier's IFD filter removes 99.97 percent of all airborne particles that pass through, such as pollen, cat dander, household dust, tobacco smoke, and mold spores. No more dust particles in that glint of sunlight, this Honeywell is equipped with a builtin ionizer that grounds airborne dust for quick vacuum cleanup. An electronic filtercheck indicator shows when it's time to clean the prefilter. Plus, an LED touchbutton control offers three fan speeds for fast filtering and whisperquiet air purifying.