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Bard 139-420BX is an OEM exhaust blade used in Bard low leakage commercial ventilator and economizer assemblies to help control relief and exhaust airflow during ventilation and economizer operation. A properly functioning exhaust blade is critical for maintaining stable building pressure and predictable outside air control, especially on wall-mounted Bard units equipped with CRV-V5A and ECON series ventilation options. This boxed Bard replacement part is intended to match original fit and function, so you can restore damper movement and sealing performance without guesswork; verify compatibility by unit model and serial number or the correct Bard parts manual before ordering.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.