Combining true HEPA filtration and unique and powerful engineering, the Allergy Pro Professional Air Purifier makes it easy and affordable to maintain an allergen-free environment. Allergy Pro true HEPA filtration captures 99.97% of pollen, dust, pet dander, mold and smoke down to 0.3 microns. Air Cleaner Machine Type: True HEPA; CADR: 137 (smoke); 156 (dust); 197 (pollen); Maximum Room Size (Square Footage): 212 sq ft; Maximum Room Size: Medium to Large Rooms.