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Bard part number 552-272-6 is an OEM blower door assembly used on select Bard wall-mounted HVAC units to close and seal the blower compartment so the indoor blower can maintain proper airflow and static pressure across the coil and filters. Replacing a damaged, missing, or warped blower door helps prevent air bypass, reduces rattles and vibration, and supports safe service access by restoring the factory fit of the blower section. The Slate designation refers to the door color used on matching units, so confirm your unit model and serial number and compare the existing door style before ordering to ensure correct fit.