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The Neoair Enviro 68108 Replacement Filter Kit will typically last 1 year under normal residential use. This kit includes two filters HEPA + Carbon filter and O.F.S.(Organic Fiber Sterilization) filter. The replacement filter indicator on the air purifier illuminates when the filters kit needs to be replaced, leaving out all the guessing. This function has been engineered to ensure your air purifier is always working in its optimal condition. | 
