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Bard S170-231 is a Bard OEM heat exchanger specified for TU088 gas furnace units, built to safely transfer heat from the burner to the supply air stream while keeping combustion gases isolated from the conditioned air. If your TU088 furnace is showing signs of a cracked or leaking heat exchanger, unusual odors, rollout issues, or failed inspection, replacing with the correct factory part helps restore proper airflow temperature rise and dependable furnace operation. Confirm the unit model and serial number before ordering, since heat exchangers are application-specific within the TU series and correct fit is critical for safe performance.