Compatible with Fellowes AeraMax 290, 300 and DX95 Air Purifiers, this Carbon Replacement Filter removes odors and captures large airborne particulates. 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 Air Purifier conveniently notifies you when it's time to replace your carbon filter.