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The Bard 171-328BX heat exchanger assembly (75K) is an OEM replacement heating-core assembly used in Bard wall-mounted packaged HVAC equipment to safely transfer heat into the supply airstream during gas heat operation. Replacing a worn or compromised heat exchanger can help restore proper heating performance and maintain correct combustion-air separation, which is critical for safe, reliable unit operation. This assembly is built to Bard specifications for fit and performance, but because heat exchangers are model and revision specific, confirm your unit model and serial number and match the original part number before ordering.
* Orders less than $50 may incure a minimum order fee.
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.