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Bard part 900-318-004 is an OEM exhaust blower assembly used in Bard wall-mounted HVAC equipment to move combustion or ventilation air through the exhaust path so the unit can operate safely and maintain proper airflow during heating operation. Replacing a worn or noisy exhaust blower can help prevent ignition and pressure-related faults, reduce nuisance shutdowns, and restore the draft performance the system was designed for. Because blower assemblies can vary by model series, voltage, and mounting orientation, confirm compatibility using your Bard unit model and serial number or the correct parts list before ordering to ensure proper fit and wiring connection.