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Bard 920-0457 is the ERVF lower blower assembly used in Bard wall-mount energy recovery ventilator packages such as the ERV-FA5 and ERV-FC5. This OEM blower assembly is built to fit the ERVF cabinet and connect to the ERV wiring harness as designed, helping restore proper airflow through the ventilator section when an existing lower blower is noisy, damaged, or not moving enough air. Replacing the lower blower assembly with the correct Bard part helps maintain balanced ventilation performance and supports consistent fresh air delivery and exhaust operation in compatible Bard ERV installations.