Honeywell ST9120C4040 Integrated Furnace Fan Control Board for Gas Heating Systems Do not add the product. and ground-fault conditions to maintain

and ground-fault conditions to maintain circuit integrity

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Honeywell ST9120C4040 Integrated Furnace Fan Control Board for Gas Heating Systems Do not add the product. and ground-fault conditions to maintainDescription The Honeywell ST9120C4040 is a replacement furnace fan control circuit board designed to manage blower operation in compatible heating systems. It ensures reliable fan control, optimized heating performance, and integration with existing HVAC components. Technical Specifications Condition New Never Used Surplus Brand Honeywell Category HVAC Controls Part Number ST9120C4040 Subcategory Furnace Fan Control Board Function Controls furnace