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Bard part number S553-630 is an OEM hood mount door assembly made from aluminum, used on select Bard wall mounted HVAC units to cover and protect the hood mounted ventilation or hood opening while maintaining the intended airflow path and weather protection. Replacing a damaged or missing door helps prevent unwanted air infiltration and debris entry and supports proper operation of the unit’s hood and vent arrangement. As a genuine Bard replacement component, S553-630 is built to match factory fit and alignment, so installation is typically straightforward when you confirm compatibility by model and serial number from the unit data plate.