Carbon Filter removes odors, VOC's and captures large airborne particulates Compatible with Fellowes AeraMax 100 Air Purifier. This item's packaging will indicate what is inside and cannot be hidden 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 100 Air Purifier conveniently notifies you when it's time to replace your carbon filter