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Lennox

OEM Lennox Heat Exchanger Assembly — 57L32

SKU: LNX-57L32 Brand: Lennox
$399.95 $549.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 57L32 heat exchanger assembly is the core heating component of your Lennox gas furnace, transferring heat from the burner combustion into the circulating airstream while keeping flue gases safely isolated from the air delivered to your home. Engineered to Lennox's exact specifications, this assembly restores reliable, efficient, and safe furnace operation.

Common failure symptoms: Signs of a failed heat exchanger include visible cracks or corrosion, flame rollout or a distorted burner flame when the blower engages, banging or rumbling sounds at startup, rust and scale flaking inside the cabinet, soot buildup, or a carbon monoxide alarm. Any of these symptoms points to a loss of exchanger integrity and calls for immediate replacement to safeguard your household.

Why OEM matters: The 57L32 is manufactured to match Lennox's burner alignment, cell spacing, and airflow geometry exactly. Aftermarket exchangers can misfit the burner assembly, create damaging hot spots, and void your warranty. The genuine OEM part ensures a direct factory fit, correct combustion clearances, and the rated efficiency and safety of your Lennox furnace. Installation should be performed by a qualified HVAC technician.

Shipping Information

  • Orders placed before 3PM CST ship same business day
  • Standard delivery: 2-5 business days
  • Express shipping available at checkout
  • Free shipping on orders over $75
  • Tracking number emailed upon shipment

Return Policy

  • 30-day returns on unused parts in original packaging
  • Electrical parts (capacitors, contactors, control boards) are final sale once installed
  • Email info@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Heat Exchanger fit my Lennox OEM Lennox Heat Exchanger Assembly — 57L32?
Yes. This is the factory-specified OEM heat exchanger for the Lennox OEM Lennox Heat Exchanger Assembly — 57L32. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.
How do I replace the heat exchanger on my Lennox OEM Lennox Heat Exchanger Assembly — 57L32?
Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.
What symptoms mean I need a new heat exchanger?
Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.
Is this heat exchanger compatible with Bryant or Payne too?
Many Lennox parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.
Should I use OEM or aftermarket for my Lennox heat exchanger?
OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.
How fast does National HVAC Parts ship?
Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.
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Mike Rivera
HVAC Parts Specialist — Online