The Helios JVK 80/50 is a robust volume control damper designed to manage airflow in ducted ventilation systems. Built with a flanged housing made of galvanized sheet steel, it ensures durability and easy integration with duct fans. The damper features hollow louvre blades mounted on polymer-supported axles, aligned uniformly for balanced airflow control. Adjustments are made using an external lever, while the servo mechanism is positioned outside the airstream, preventing malfunctions caused by dust or contaminants.