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The Bard S152-176-4 burner door is an OEM service replacement door used on Bard wall-mounted HVAC units with gas heat to properly close off the burner compartment for safe operation and correct combustion airflow. Replacing a bent, rusted, or leaking burner door helps maintain the intended seal around the burner area, supports steady burner performance, and keeps the heating section protected during operation and service. Match this part by Bard part number S152-176-4 to your unit documentation to confirm exact fit before ordering.