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Lennox

OEM Lennox Heat Exchanger Assembly — 13X45

SKU: LNX-13X45 Brand: Lennox
$399.95 $549.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 13X45 heat exchanger assembly (factory reference 612218-07) is the heart of your Lennox gas furnace's heating cycle. It absorbs heat from the burner combustion and transfers it to the blower air stream, all while sealing the harmful flue gases away from your home's air. Manufactured to precise Lennox tolerances, the 13X45 restores full, safe heat output and proper combustion venting.

Common symptoms of a failing heat exchanger include hairline cracks, rust or corrosion, a yellow or wavering burner flame, soot deposits, strange smells during operation, and rising carbon monoxide levels. Any crack compromises safety, making replacement the correct fix.

Why OEM matters: as a combustion-critical, life-safety component, the heat exchanger demands exact metallurgy, weld quality, and fit. The OEM 13X45 is built to Lennox specifications so it seats perfectly against the burner assembly and collector box, keeps your furnace's certification intact, and delivers the durability aftermarket parts can't match. Choosing OEM protects your equipment warranty and your family's safety.

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 — 13X45?
Yes. This is the factory-specified OEM heat exchanger for the Lennox OEM Lennox Heat Exchanger Assembly — 13X45. 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 — 13X45?
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
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