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Bard part number S139-323 is an OEM blade assembly service part used in Bard wall-mount unit free cooling (economizer) sections, where the blade helps regulate outdoor air flow for ventilation and free cooling operation. If your unit has damaged, bent, or binding blades that cause poor economizer response, air leakage, or actuator strain, replacing the blade assembly with the correct Bard OEM component helps restore proper damper movement and dependable operation. As with most economizer hardware, confirm fit by matching the full unit model and service literature before ordering, especially when multiple free cooling configurations are used across different Bard series.