Suffer allergies? Then you’ll love its 4 layers of filtration! Its carbon pre-filter captures large particles and absorbs odors/gases/VOCs, the 360° True HEPA filter traps 99.97% of smaller particles, the sanitizing UV-C light reduces germs/viruses/mold. Its IntelliSense air-quality indicator measures the surrounding atmosphere 60 times per minute, 24/7, automatically adjusting purifier speed when poor air quality is detected. Quiet operation with 3 speeds (low, medium, high) and 2 modes (auto, sleep); 8-hour timer and change-filter indicator. Circulates air in medium (215 sq. ft.) rooms every 12.5 minutes, in large (1040 sq. ft.) rooms every hour. 9.75" w x 12" h x 9.75" d.