The Honeywell HPA-150 True HEPA Tower Allergen Remover offers all of the benefits of True HEPA in an attractive tower design. It boasts many impressive features including true HEPA filters that capture up to 99.97% of microscopic allergens such as pollen, dust, smoke, and pet dander as small as 0.3 microns, a premium carbon pre-filter to help reduce unpleasant household odors and reduce certain common household gases, Easy-to-use controls, 3 air cleaning levels, an electronic filter replacement reminder. This air cleaner is ARB Certified to comply with the federal ozone emissions limit. The Tower Allergen Remover has been AHAM Certified for use in rooms up to 177 square feet. Its certified CADR ratings are: 110 for smoke, 125 for dust and 130 for pollen.