What are the specs for this Heat Exchanger?

The correct replacement for Lennox model OEM Lennox Heat Exchanger Assembly — 57L29 is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Lennox equipment which lists the model number OEM Lennox Heat Exchanger Assembly — 57L29.

What symptoms indicate I need a new heat exchanger?

Common symptoms that indicate you need a new heat exchanger include unusual noises, intermittent operation, complete failure to operate, or visible damage. For specific diagnostic guidance, visit nationalhvacparts.com/pages/hvac-diagnostic.

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Lennox

OEM Lennox Heat Exchanger Assembly — 57L29

Name: OEM Lennox Heat Exchanger Assembly — 57L29
Brand: Lennox
SKU: LNX-57L29
Price: 399.95 USD
Availability: InStock

SKU: LNX-57L29 Brand: Lennox

$399.95 $549.95

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The genuine OEM Lennox 57L29 heat exchanger assembly is the core combustion component of your Lennox gas furnace, transferring heat from burning fuel to the circulating air stream while keeping combustion byproducts safely separated from the air you breathe. Built to exact factory specifications, it restores your furnace to rated heating capacity and efficiency.

Common failure symptoms: A failing heat exchanger often shows visible cracks or rust, produces a flickering or distorted burner flame, triggers repeated flame-sensor or limit-switch faults, or causes the furnace to short-cycle. Cracks can allow flue gases — including carbon monoxide — to mix with heated air, making prompt replacement a safety priority.

Why OEM matters: Because the heat exchanger is both a safety and pressure-tested component, only a genuine Lennox 57L29 assembly guarantees the correct metallurgy, weld integrity, and dimensional fit your furnace was engineered around. Aftermarket substitutes can compromise combustion sealing and void your equipment warranty. Choose the OEM part for reliable, code-compliant heating performance.

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

OEM Lennox Heat Exchanger Assemb...

$399.95

Frequently Asked Questions

Does this Heat Exchanger fit my Lennox OEM Lennox Heat Exchanger Assembly — 57L29?

Yes. This is the factory-specified OEM heat exchanger for the Lennox OEM Lennox Heat Exchanger Assembly — 57L29. 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 — 57L29?

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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OEM Lennox Heat Exchanger Assembly — 57L29

Shipping Information

Return Policy

Frequently Asked Questions