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The Bard S152-216 vestibule door assembly is an OEM access door used on Bard wall mounted HVAC units to close off and protect the vestibule area where service access and key components are located. Replacing a worn, bent, or missing vestibule door helps maintain proper airflow control, keeps debris and weather out of the cabinet interior, and restores the correct fitment of the unit’s access opening so routine maintenance and troubleshooting can be performed safely and cleanly with the correct factory door in place.