JVK 40/20 – Helios – Volume Control Damper Frame housing with double-sided connection flange made of galvanized sheet steel. Suitable for duct fans. Slats formed as a hollow body. Axles mounted in plastic, running in the same direction, adjustable by external lever. Adjusting mechanism also outside of the air flow and thus secured against malfunctions due to contamination. Product PDF: JVK CATALOGUE
