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Bard part 8620-204 is an OEM ERV Bearing, Shaft, and Hardware Kit used to restore smooth, reliable rotation in Bard energy recovery ventilator assemblies where shaft support and bearing condition directly affect airflow and noise levels. This kit is intended for a direct-fit replacement when servicing worn bearings or a damaged shaft, helping your Bard ERV operate correctly with proper alignment and reduced vibration. Because ERV hardware can vary by model and production revision, confirm compatibility by matching the part number to your unit data plate or Bard parts list before ordering.