Neff Z51ITI1X4 Recirculation Kit is a premium solution for efficient and effective recirculation operation. The advanced kit consists of Clean Air Standard active carbon filter, deflector, flexible hose of 150 mm, 800 mm long with 2 hose clamps and mounting material. It will create a fresher and healthier kitchen environment for your family. This efficient filter recirculates the air to keep bad food odours at bay by absorbing the grease residue left behind after use. The additional Anti-fish functionality feature is specially treated to prevent the fish smell. We recommend replacing your carbon filter at least once every 6 months for optimum efficiency.