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The Bard 9043-340 heat exchanger assembly (4016000) is an OEM furnace heat transfer component used in Bard wall mounted gas/electric package units, designed to safely move heat from the burner section into the supply air stream so the unit can deliver reliable space heating. Replacing a damaged, corroded, or leaking heat exchanger helps restore proper heat output and maintain safe combustion operation, which is especially important when troubleshooting rollout, limit trips, poor heating performance, or suspected flue gas issues. Because heat exchanger configurations can vary by model and burner count, confirm fit using your Bard unit model and serial number before ordering to ensure the correct assembly for your specific cabinet and burner setup.