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Bard part number S139-239 is an OEM damper blade assembly used in Bard wall mounted HVAC ventilation and free cooling air paths to help regulate outside air intake and return air by opening and closing smoothly as commanded by the unit. Replacing a bent, binding, or leaking damper blade assembly can restore proper airflow control, improve economizer operation, and help the unit maintain stable temperatures without overworking the blower or refrigeration system. For best fit, confirm the unit model and serial and cross check the part number in the correct Bard parts list before ordering, since damper components can vary by cabinet and free cooling configuration.