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Bard S913-0048 Flue Collector Box Assembly is an OEM combustion venting component used on Bard wall-mounted gas heating HVAC units to collect flue gases at the heat exchanger outlet and route them into the vent/flue connection for safe, consistent exhaust flow. A damaged or leaking collector box can contribute to venting issues and unsafe operation, so replacing it with the correct Bard part helps restore proper draft, sealing, and reliable heater performance. Verify compatibility by matching the full part number to your Bard parts list or unit model and serial information before ordering, since flue components can vary by cabinet size and heat section configuration.