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Bard part 139-354 is an OEM blade used in Bard wall mounted HVAC equipment where a correctly fitted blade is critical for proper airflow and reliable operation. If you are servicing a Bard ventilation or economizer style air path that uses a blade assembly, replacing a worn, bent, or damaged blade with the correct Bard 139-354 helps restore smooth movement and consistent performance without forcing mismatched parts. Confirm the unit model and parts list before ordering, since Bard uses multiple blade styles across product families and revisions.