An evasé  (eee-va-say) is a critical component in industrial fan systems that significantly enhances performance and efficiency. Installed on the fan outlet, it helps improve airflow by providing a natural path for the gas to expand. The evasé  connects to the fan outlet at the smaller flange side and gradually expands outward. While the outer edge of the evasé  expands at a consistent rate, the inner edge expands more significantly, resulting in a much larger flange at the opposite end.