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Bard part number S900-172 is an OEM blower assembly used to move return air across the indoor coil and distribute conditioned air through the unit, helping the system maintain proper airflow, temperature control, and overall capacity. A worn or failing blower assembly can lead to weak airflow, icing concerns, nuisance safety trips, and higher operating stress, so replacing it with the correct Bard factory part is the best way to restore intended performance and fit. Confirm compatibility by matching S900-172 to your Bard model and serial information before ordering to ensure the correct blower configuration for your specific wall-mounted unit.