Dyn-O-Mate Hollow Turning Vane and Rail is double wall strength. It is designed to redirect the air through elbows and tees in the ductwork without significant loss of air pressure. Assembled Vane & Rail minimizes turbulence in the ductwork. Duro Dyne Rail has self aligning tabs for easy vane installation. Dyn-OMate Vane has reinforcing dimples for added stability.