With their revolutionary HEPASilent technology, which combines mechanical and electrostatic filtration, Blueair air purifiers outperform most standard HEPA units by capturing 99.7% of particles at 0.1 micron. As Energy Star appliances, Blueair air purifiers consume about as much power as a light bulb. Thanks to patented SurroundAir technology, the nearly silent Blueair air purifiers achieve peak performance without the noise or draft of a powerful fan.