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Bard part S170-233 is an OEM heat exchanger assembly used in Bard TU132 gas furnace units, where it transfers heat safely and efficiently from the burner section into the airstream. Replacing a worn or compromised heat exchanger helps restore proper heating performance and supports safe furnace operation, especially when diagnosing issues like poor heat output, unusual odors, or suspected exchanger damage. Because TU series furnaces have model specific heat exchanger variations, confirm your full unit model and serial number against the Bard parts manual before ordering to ensure correct fit and to minimize downtime during service.