Hercules carries a wide variety of turning vanes and vane rail, in both 2" and 4" sizes. We manufacture our own style, and also offer Duro Dyne, Ductmate's ProRail and Sheet Metal Connectors' EZ Rail.  We also represent Aero-Dyne "High Efficiency Profile" turning vane and rail. For more information, visit their website at www.aero-dyne.net