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Bard part number 552-324-6 is an OEM blower door assembly for Bard wall mounted HVAC equipment, designed to close off the blower compartment so the indoor blower can pull and deliver air correctly across the system. Replacing a damaged or warped blower door helps prevent air leakage, supports proper airflow and static pressure, and keeps the blower section protected during normal operation and service. This is the correct Bard factory replacement when you need the BLOWER DOOR ASSEMBLY-SLATE specified for the unit, and matching the original door style and fit is important to avoid vibration, noise, and airflow performance issues after installation.