The Helios JVK 50/25 is a robust volume control damper designed for integration with duct fan systems. It features a flanged housing made of galvanized sheet steel, offering durability and compatibility with ventilation ducts. The hollow louvres are mounted on polymer-supported axes, enabling smooth, synchronized movement. Adjustment is made easy with an external lever, while the servo mechanism is positioned outside the airflow, ensuring it remains free from dust and debris for reliable long-term operation.