The Helios JVK 50/30 is a precision-engineered volume control damper designed for use with duct ventilation systems. Its housing is constructed from galvanized sheet steel and includes connection flanges on both sides for secure installation. The damper features hollow louvres mounted on polymer-supported axes, ensuring smooth and synchronized movement. Adjustment is performed via an external lever, and the control mechanism is placed outside the airstream to prevent operational issues caused by dust or debris.