The Coway Airmega 400 air purifier efficiently filters harmful sources in your space and captures 99.999% of nano-sized particles down to 0.01 microns, which is smaller than most allergens, bacteria, mold, and viruses. With coverage of up to 1,560 square feet, Coway’s three-stage HyperCaptive™ filtration system (with Green True HEPA™ filter) wraps any space in clean air, 24 hours a day. Features filter change indicators, Smart Mode (that adapts the air purifier to its surroundings), and real-time air quality monitoring.