Description Carbon filter removes odors and captures large airborne particulates Filter should be changed every 3 months Filter change indicator notifies users when it is time to replace the carbon filter Large filter This Carbon Filter removes odors and captures large airborne particulates. It is compatible with the Fellowes AeraMax 300 Air Purifier. With normal usage, it is recommended that you change your filter every 3 months to keep your air purifier running at peak performance. A filter change indicator on your Fellowes AeraMax 300 Air Purifier conveniently notifies you when it's time to replace your carbon filter.