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Bard part number 169-150 is an OEM flue box wrapper used in Bard wall mounted gas/electric equipment to help form and protect the flue box area so combustion byproducts are directed through the intended venting path. A damaged or missing wrapper can lead to poor draft, nuisance shutdowns, and heat related wear around the burner and flue section, so replacing it with the correct Bard factory part helps restore proper fit and safe exhaust routing. Verify compatibility by matching your unit model and serial number to the correct flue box components in the Bard service literature before ordering, since flue parts are application specific and must seal and align correctly for reliable operation.