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Bard part number 520-218 is an OEM burner partition assembly used in Bard wall-mounted gas/electric HVAC equipment to separate and organize the combustion section so the burner area maintains proper airflow paths, stable flame pattern, and consistent heat distribution through the heat exchanger. When this internal divider is damaged, warped, or missing, it can contribute to noisy operation, poor burner performance, or nuisance safety shutdowns, so replacing it with the correct Bard 520-218 helps restore the unit’s intended combustion chamber layout and serviceability. Confirm compatibility by matching the part number to your Bard model and parts manual before ordering, since burner section components can vary by series and heating configuration.