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The Bard S913-0036 Flue Collector Box Assembly is an OEM combustion air and venting component used on select Bard wall mounted gas/electric units to gather flue products at the heat exchanger outlet and route them to the inducer and vent connection. A properly sealed collector box helps maintain correct draft, supports safe removal of combustion gases, and can prevent nuisance pressure switch faults and rollout related shutdowns when the original part is damaged, warped, or leaking. Because fit and port orientation matter on gas heat sections, match the S913-0036 part number to your unit model and serial before ordering to ensure the assembly installs correctly and restores factory venting performance.