Why do we need to install turning vanes in square-throat elbows, and how do they affect static pressure

Plain-English answer

Air hitting a hard 90^\circ sharp corner cannot turn the sharp corner cleanly; it smashes into the flat back wall of the elbow, creating a massive zone of turbulent, rolling air that drastically increases system static pressure resistance. * Turning Vanes act as small, curved sheet metal guide tracks that smoothly split and shepherd the air stream around the turn, reducing static pressure drops across the elbow by up to 80%.

Field checklist

• Air hitting a hard 90^\circ sharp corner cannot turn the sharp corner cleanly; it smashes into the flat back wall of the elbow, creating a massive zone of turbulent, rolling air that...

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