After extensive R and D, Homedics has created the world's most advanced air cleaning system. Its scientifically-superior technology features 3-stage filtration coupled with state-of-the-art Nano Coil Technology to effectively remove 99% of airborne allergens including dust, pollen and smoke. It reduces bacteria and kills cold and flu viruses too! All while using 50% less energy than comparable HEPA towers. Features washable, replaceable filter that lasts up to 18 months, backlit LCD display and remote.