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The Bard 8201-122 electronic fan timer is an OEM control component that manages blower fan run timing in compatible Bard wall mounted packaged HVAC units, helping the fan start, run, and cycle as intended for proper air movement and system operation. This fan timer board is used to maintain consistent airflow and support correct equipment sequencing after a call for cooling or heating, which can improve comfort and help prevent nuisance issues caused by incorrect fan operation. Because this is a control part, confirm compatibility by matching the full Bard part number and verifying the unit model and wiring connection before ordering to ensure proper fit and function.