KEI Model GVD Geared Volume Dampers are precisionengineered for accurate air volume regulation and system balancing in HVAC duct networks. The damper features an aerofoil blade design, incorporating fixed aluminum aerofoilprofiled blades that ensure smooth airflow characteristics with minimal turbulence and reduced pressure drop. The aerodynamic blade profile promotes laminar airflow across the damper, improving control stability and overall system efficiency while significantly minimizing noise generation.