TRUE HEPA H13 FILTER WITH ADVANCED 4-STAGE FILTRATION SYSTEM: 4-stage filtration (Pre-filter, Antibacterial Coating, True HEPA Filter, High-Efficiency Activated Carbon Filter, and Net Filter) can effectively capture 99.97% of particulates as small as 0.3 micros such as allergens, pet odor, hair, dander, smoke, cooking fumes, mold, germs, bacteria and large dust particles. This air purifier can improve indoor air quality, freshen air at home, and help you breathe better.HIGH EFFICIENCY AIR PURIFIER: With a CADR rate of 100 CFM (170 m/h), this air eliminator can circulate an entire rooms air 3 times per hour in spaces up to 220 sq.ft (20m). Unique size and contemporary design make the RENPHO air purifier perfectly suited for small or medium sized rooms like living rooms, bedrooms, kitchens, offices, and dorms.3 FAN SPEEDS WITH SLEEP MODE AND WHISPER-QUIET OPERATION: Choose from low, medium, or high fan speeds according to the air quality. Operates quietly at 26dB during sleep mode so your air is purified while