The Backer Nona 2m60 Sensor is a specialized charcoal filter designed for use with the corresponding range hood model to enable air recirculation. By utilizing a combination of a plastic grid and carbon filtration material, it effectively removes grease and cooking odors from the air before it is released back into your kitchen. To ensure the ventilation system functions correctly, you will need to install two filters simultaneously. This circular design fits precisely into the hood, providing a practical solution for homes where external ducting is not an option.