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Bard S5151-045 is an OEM 20 inch, 4 blade condenser fan blade assembly used to move the correct amount of outdoor air across the condenser coil so your Bard wall mounted package unit can reject heat properly and maintain stable head pressure. Replacing a bent, cracked, or out of balance fan blade helps reduce vibration, noise, and motor strain while restoring designed airflow for efficient cooling and heat pump operation. Verify blade diameter, rotation direction, and hub mounting details against your unit model and serial before ordering, since this part number has been superseded in some parts catalogs.