Features: *Compatible with Multiple Furnace Models: The Furnace Fan Control Circuit Board ST9120C4040 is designed to work in furnaces starting with models For EG6E,For EG6G,For GUK, andFor GUJ. It replaces old part numbers R40403-001 and ST9120A2004 for enhanced compatibility. *Reliable Performance: This circuit board is brand new and guarantees optimal performance. With its advanced design and construction, it ensures efficient control and operation of the furnace fan. *Easy Replacement: The Part# R40403-003 is a direct replacement for the boards mentioned above. It can be easily installed in the furnace without any additional modifications or adjustments. *Enhanced Functionality: This circuit board is equipped with the latest technology, providing improved functionality for controlling the furnace fan. It ensures smooth operation and reliable performance, giving you peace of mind. *Long-lasting: Built to withstand regular use, this Furnace Fan Control Circuit Board is made from high-quality materials for durability. It is designed to withstand varying conditions and for ensure long-lasting performance without frequent replacements. Specifications: *Product Name:Furnace Fan Control Circuit Board ST9120C4040 *Material:PCB *Size:As shown in the picture *Color:As shown in the picture Blower control board fit for: For Concord furnaces for Armstrong for Ultra SX 80 SX90, for ST9120C, for Ducane, for Lennox Package Included: 1x Control Circuit Board