Brethe Air Cleaner Replacement Filter for AR-NC01 and AR-NC02 with Nano Coil Technology Replacement Filter provides cleaner, fresher healthier air for the whole family. World's most advanced air cleaning system; Cleanable, replaceable - lasts up to 18 months; 99% effective at removing airborne contaminants like allergens, smoke, pollen, dust and germs; 5X better than HEPA at removing microscopic contaminants down to 0.05 microns in size; Reduces airborne viruses and bacteria; Includes 1 filter; Compatible with Homedics Brethe Air cleaner, model AR-NC01.