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the "/U" suffix simply denotes a "Universal" or traditionally boxed retail version
crucial for low-temperature radiant heating systems
The motor is side-mounted on the 20" dimension
The spring return is a mechanical safety feature that automatically moves the damper to its "home" position if electricity is lost
Thermal Resilience: Constructed from high-heat gaskets materials that maintain structural integrity and sealing pressure under continuous high-fire operation
York S1-373-19801-420 Wiring Harness 318518-761 the "/U" suffix simply denotesFor service technicians maintaining gas furnace and package unit systems, the York S1 373 19801 420 Wiring Harness provides a reliable 8 wire configuration specifically engineered for high durability internal circuitry connections. As a genuine OEM York replacement part, this harness ensures precision terminal alignment and maintains the electrical integrity of the system's control logic. It is commonly utilized in specific residential furnace models,