Text on the drawing
SQUARE ELBOW NOTES: 45 DEGREE ENTRY BRANCH TAKE-OFF r MINIMUM r = W HOLLOW DOUBLE RADIUS TYPE TURNING VANES SEE NOTE 1 AIR SQUARE ELBOW SHOWN. PROVIDE ROUND ELBOW WHERE SHOWN ON PLANS. FLOW AIR FLOW DOUBLE RADIUS TURNING VANES MANUAL DAMPER 0.5W MINIMUM 45 O W 0.25 X W OR 4" MINIMUM W
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