The Helios JVK 60/30 is a robust volume control damper designed for efficient airflow regulation in duct systems. It features a flanged housing made of galvanized sheet steel with connection flanges on both ends for seamless integration. The hollow louvre blades are mounted on parallel axes supported by polymer bearings, enabling synchronized operation. An external lever allows easy manual adjustment, and the servo mechanism is located outside the airstream to ensure reliable performance even in dusty environments.