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The Bard 8620-205 ERV Shaft and Hardware Kit is an OEM replacement kit used in Bard energy recovery ventilator (ERV) assemblies to restore smooth, reliable rotation of the ERV wheel and proper alignment of the drive components. When an ERV develops shaft wear, looseness, or hardware issues that cause noise, vibration, or reduced ventilation performance, replacing the shaft and matching fasteners with the correct Bard kit helps bring the ERV back to factory-correct operation and fit. This is the right choice for technicians and facility maintenance teams who want a direct-fit Bard part number for service work on compatible Bard ERV-equipped systems, and it is best practice to confirm applicability by matching 8620-205 to your unit model and parts list before ordering.