Enjoy the benefits of high efficiency, True HEPA air filtration without the expensive True HEPA replacement filter costs. Honeywell True HEPA air purifiers are the best choice for reducing airborne allergens. In fact, more doctors recommend Honeywell enviracaire® air purifiers to their patients than any other brand.** The True HEPA filter removes at least 99.97% of common household particles as small as 0.3 microns from the air passing through it such as dust, pollen, tobacco smoke, mold spores and cat dander. It even helps reduce viruses and bacteria.* The carbon pre-filter captures larger airborne particles and helps remove common household odors. The CPZ (Carbon, Potassium Permanganate and Zeolite) filter is a highly effective material in reducing household odors, tobacco odors, pet odor, volatile organic compounds (VOCs) from different kinds of modern chemical products including paints, cleaning supplies, pesticides, building materials/furnishing and office equipment . QuietCare™ sound reducing technology provides ultra quiet operation. The Intelli-Check™ Electronic Filter Indicator reminds you when to replace the True HEPA filter and when to replace the carbon pre-filter. This model is recommended for Large size rooms up to 60m².