Please check for compatibility with your ventilation before purchasing, For ventilation that uses recirculation kit RECIRISL, Efficiently neutralizes odors in your kitchen so that cooking aromas and fumes don't linger while you are cooking, Carbon filters should be replaced when they are noticeably dirty or discolored (usually every 4 to 6 months, depending on usage), This item has model numbers of CHFILISL, KF001010, and RECIRISL