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Bard part number 9041-033 is an OEM heat exchanger used in Bard high economy gas fired furnace applications identified as IC85D42A/C, where it transfers heat from combustion to the supply airstream while keeping flue gases isolated from the indoor air path. Replacing a worn or damaged heat exchanger is critical for safe operation, proper temperature rise, and dependable ignition and draft performance, especially in older furnaces where fatigue or corrosion can lead to cracks or hot spots. As a distributor we recommend confirming the furnace model and serial number from the rating plate and matching the exchanger style and mounting points before ordering, since heat exchanger assemblies are model-specific and often tie into the burner section and collector/flue components.