The Universal FHC009 2-in-1 Grease & Carbon Filter is important for removing odours whilst the hood is recirculating air around the kitchen. It does this by absorbing moisture, grease and smoke while you cook, making it particularly important if your hood does not have outside venting. Made using self-extinguishing material and high absorption active carbon, it captures and eliminates unpleasant odours released by the steam from cooked food. You ideally need to replace the filters in your cooker hood every 3 to 12 months, depending on how much you like to cook. Filter Part No. 484000008524 Filter Part No. 484000008524