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Lennox

OEM Lennox Heat Exchanger Assembly — 11X46

SKU: LNX-11X46 Brand: Lennox
$399.95 $549.95

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

The genuine OEM Lennox 11X46 heat exchanger assembly (interchange 605996-96 / 612225-06) is the core combustion component of your Lennox gas furnace. It transfers heat from burning fuel to the air moving across it while keeping combustion gases safely separated from your home's air supply. This factory assembly is engineered to the exact metallurgy, tube geometry, and clearances Lennox specifies for your furnace model.

Common failure symptoms: A worn or cracked heat exchanger often shows up as a rusty or sooty appearance, a flickering or shifting burner flame, unusual smells during operation, or a flame-rollout / limit switch that repeatedly trips. Cracks can also allow carbon monoxide to enter the airstream, which is why a compromised heat exchanger must be replaced promptly rather than patched.

Why OEM matters: Aftermarket heat exchangers frequently deviate in steel grade, weld quality, and dimensional fit, which can lead to premature cracking, poor efficiency, and failed safety inspections. The OEM Lennox 11X46 restores rated heating output, preserves your furnace's AFUE efficiency, and keeps the unit compliant with its original safety certification. Direct factory fit means faster installation and long-term reliability for your Lennox system.

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 — 11X46?
Yes. This is the factory-specified OEM heat exchanger for the Lennox OEM Lennox Heat Exchanger Assembly — 11X46. 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 — 11X46?
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