Keep kitchen airborne pollutants at bay with activated carbon The activated carbon contained in the filter works to capture odours, oils & grease released whilst cooking, preventing them from entering the kitchen. Keeping your air flow fresher for longer. Genuine range hood filter replacement Carbon filter made specifically for selected Westinghouse and Chef range hoods Easy quarterly replacement for optimal performance It is recommended that you replace your filter every 3-4 months, or as required, depending on the style and frequency of cooking. Quick and easy filter installation It's as simple as 'twist and replace' with your new replacement filter.