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Bard 913-0048 is an OEM flue collector box assembly used on Bard wall mounted gas electric HVAC units to gather combustion flue gases at the heat exchanger outlet and route them into the venting path for safe, consistent draft. When this collector box is cracked, leaking, or warped, it can contribute to improper venting, nuisance limit trips, and combustion odor issues, so replacing it with the correct Bard factory part helps restore the unit’s designed combustion airflow and reliable heat operation. Verify compatibility by matching the part number to your unit model and serial information before ordering, since collector box designs can vary by chassis and heat section.