Round and square ninety-degree duct elbows with centerline dimensions and turning vanes. The round elbow requires a centerline radius of one and a half times the diameter where space permits, or equal to the diameter otherwise. The square elbow incorporates internal turning vanes at the ninety-degree mitered junction to maintain smooth airflow.
ROUND 90 ELBOW SQUARE 90 ELBOW W W D D TURNING VANES CL CL R = 1.5xD WHERE SPACE PERMITS OR R = D
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