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Bard part number 171-108 is an OEM heat exchanger designed for Bard H140 and H160 heating sections, helping safely transfer heat from the burner area into the supply airstream while keeping combustion gases contained and properly routed to the vent system. If your unit is showing signs of heat exchanger failure such as rollout trips, abnormal burner behavior, or confirmed cracks during inspection, replacing the heat exchanger with the correct Bard factory part helps restore proper furnace operation and maintain the intended safety controls and draft performance. Confirm compatibility by matching the full unit model and serial information, since heat exchanger configurations can vary by model revision and gas heat option.