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The Bard 552-323-6 blower door assembly (slate) is an OEM service replacement access door used on Bard wall-mounted HVAC units to properly close and seal the blower compartment. A correctly fitting blower door helps maintain designed airflow, reduces air leakage and rattles, and keeps internal components protected from dust and debris during operation. This Bard factory part is built to match original door geometry for proper alignment with the cabinet opening, which makes it the right choice when a door is damaged, missing, or no longer sealing correctly after service work. Verify your unit model and serial information against the Bard parts list to confirm compatibility before ordering.