Bissell Replacement Carbon Filter for the air400 2520

Carbon Filter for the BISSELL air400 Air Purifier Series 24791. Follow these instructions for filter replacement: - Make sure the Air Purifier is turned OFF and unplugged before replacing the filters - Each filter has blue easy pull tabs. The tabs should face outward. - Insert activated carbon filter before inserting HEPA + Pre-Filter. - The Pre-Filter attached to the HEPA filter should face outward. NOTE: Filter life varies based on runtime and existing air conditions. It is recommended to replace both the HEPA + pre-filter and activated carbon filter once every six months.