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Bard part number 5151-059 is an OEM 18 inch, 3 blade fan blade designed for counterclockwise rotation to move the correct volume of air through the unit for proper heat transfer and stable head pressure. This blade is commonly specified with a 1/2 inch bore and a 20 degree pitch, making it a fit critical replacement when restoring airflow on Bard wall mounted and packaged equipment. Replacing a bent, cracked, or mismatched fan blade with the correct Bard OEM part helps reduce vibration, protect the motor bearings, and bring the system back to intended operating performance; always confirm rotation direction, diameter, pitch, and bore size against your unit data plate or parts list before ordering.