TRUE HEPA Filter (Captures 99.97% of airborne particles 0.3 microns), Carbon Activated Pre-filter helps reduce odors from pets, smoke, and cooking, Ideal for 210 Square Feet Area with high CADR (Smoke 135, Dust 145, Pollen 228), 3 Fan Speeds with Electronic Control, Silencer Technology: operates as low as 30dB (low fan speed).