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The Bard S921-0003 Exhaust Duct Assembly is an OEM ducting component used on select Bard wall-mount HVAC systems with exhaust setups to help route discharge air where the unit design requires it and maintain proper airflow management through the exhaust path. Replacing a damaged or leaking exhaust duct assembly can help prevent airflow restrictions and nuisance issues tied to improper exhaust routing, especially on applications using economizers or ventilation accessories. As a genuine Bard part, S921-0003 is built to match the original fit and mounting points intended by the manufacturer, making it a dependable choice when you need the correct factory duct assembly for a service repair.