True HEPA Compact Tower Allergen Remover is the #1 brand recommended by allergists; True HEPA filter captures up to 99.97% of microscopic allergens, 0.3 microns or larger; Helps capture certain airborne germs; Carbon pre-filter helps reduce unpleasant odors; Manual controls, 3 cleaning levels; Electronic filter replacement reminders; Circulates room air up to 5 times an hour; AHAM CADR (smoke): 48/Rm Size: 8x9 (75 sq. ft.); Energy Star Certified.