•Aero Dyne Turning Vanes with engineered sound control performance can help improve acoustical performance and room noise compliance. •Because of this, HVAC engineers and designers rely on our vanes when building hospitals, educational facilities , and performance art centers. •The precise airfoil contour reduces generated sound power to the lowest attainable levels, and lower sound power results in lower sound pressure. •Laboratory test data (Report no. 48037 dated 9/5/87) proves Aero Dyne H-E-P Turning Vanes & Rail have reduced sound power levels as compared to symmetrical vanes, single-thickness vanes , and vanes with different center spacing. •Lower sound power levels will result in lower sound pressure levels (dBA) for comparable installations. •Airfoil Blade: 17-Point roll-formed process using one piece of 27GA HD Prime Carbon Galvanized steel, furnished in 10 ft. lengths •Vane Rail: 24GA HD Galvanized steel, assembly slots located on design center spacing of 2.4”, furnished in 100 ft. coils •Fasteners: Ring Shank style screws fasten into continuous channels inside the blade, no annoying rattle, no detaching, no reinforcing rods necessary