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Bard part number 5151-050 is an OEM condenser fan blade assembly designed for Bard wall-mounted and packaged HVAC units that use a 20 inch, 4 blade, counterclockwise rotating propeller. Replacing a damaged or out of balance fan blade helps restore proper condenser airflow, reduce vibration and noise, and protect the fan motor and refrigerant system from overheating during peak load. For best results, verify the required rotation direction and diameter from your unit data plate or service literature, and confirm the blade set screw and hub match your existing mounting so the replacement installs correctly and maintains factory performance.