Opposite Blade Damper Description The LinkedAir Opposite Blade Dampers are designed to offer air flow control. This is suitable for use with the majority of grilles and diffusers within the QVE range. Construction The LinkedAir Opposite Blade Dampers are made out of aluminium profiles. The standard grilles are powder coated in Black, while other finishes can be powder coated in accordance with the customers’ specifications. Product Code Q-OBD Q-OBDMaterialFlangeColour StandardAluminium5mmBlack Opitional / /Special Colour (PowderCoated)