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Bard part number S169-150 is an OEM flue box assembly used on Bard HVAC equipment to collect and route combustion exhaust safely through the unit venting path. A worn, rusted, or leaking flue box can lead to poor draft, nuisance shutdowns, or unsafe venting conditions, so replacing it with the correct Bard factory assembly helps restore proper exhaust flow and reliable heat operation. Because flue components can vary by model series and fuel setup, confirm your unit model and serial number and match the original parts breakdown before ordering S169-150 to ensure correct fit and safe installation.