Turning vane is designed for commercial fiber glass duct board systems and assists air flow around 90-degree elbows with minimal pressure loss. The vane's exterior surface is treated to eliminate the potential for fiber erosion. The airstream surface contains an EPA-registered anti-microbial, and it meets all the requirements of UL181, G21, and G22. The lightweight turning vane is designed to operate at air velocities up to 5000 fpm, temperature up to 250°F, and maximum internal pressures of 2 in. water gauge.