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The Bard 171-317BX is an OEM 100K heat exchanger assembly used in select Bard HVAC gas heating sections to transfer heat safely and efficiently into the supply airstream while keeping combustion byproducts contained. When a heat exchanger is cracked, restricted, or otherwise damaged, replacing it with the correct factory assembly helps restore proper heat output, combustion performance, and overall unit reliability. Because fit and application can vary by model and production series, confirm 171-317BX against your Bard unit model and serial number or the correct Bard parts breakdown 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.