Sheet detailing standard HVAC ductwork connection geometries including a forty-five degree entry branch take-off with dimensional requirements relative to duct width W, a radius elbow with a minimum centerline radius equal to W, and a square elbow equipped with hollow double-radius turning vanes. The branch take-off specifies a minimum offset of zero-point-five W and a minimum throat dimension of zero-point-two-five W or four inches. The square elbow incorporates turning vanes per note one to maintain smooth airflow direction changes.
45° ENTRY BRANCH TAKE-OFF W 45° W RADIUS ELBOW MINIMUM r = W r SQUARE ELBOW AIR FLOW HOLLOW DOUBLE RADIUS TYPE TURNING VANES SEE NOTE 1 0.25 X W OR 4" MINIMUM 0.5W MINIMUM
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