The Carbon Filter removes odours and captures large airborne particulates. Compatible with Fellowes® AeraMax® 290, 300 and DX95 Air Purifiers. 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.