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Bard 171-149 is an OEM heat exchanger used in Bard IH60 gas heating sections, built to transfer heat safely and efficiently from combustion to the supply air stream while keeping flue gases isolated from the occupied space. If your IH60 is showing signs of a failed heat exchanger such as cracks, soot, rollout, unusual odor, or repeated limit trips, replacing the heat exchanger restores proper heat output and helps bring the unit back to reliable, code compliant operation. For best fit, confirm the exact IH60 model and serial number range in the unit parts list before ordering, since heat exchanger configurations can vary by production run and by heat section style.