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Bard 139-420BX - Exhaust Blade

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.


  • Technical Specifications
  • Product number: 139-420BX
  • Manufacturer description: Exhaust Blade - Boxed
  • HTS Code: "8415.90.8085"

$168.00

What does the "BX" suffix mean?

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.