Product Name
$0.00
✅ In Stock
🚚 Ships Today
🔒 OEM Certified
🔄 30-Day Return
Same-day dispatch if ordered by 3PM CST
Free shipping on orders $75+
Check compatibility before ordering
IMAGE COMING SOON
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
The genuine OEM Lennox 14D79 heat exchanger assembly (factory numbers 614580-48 / 612218-41) is engineered for two-stage Lennox gas furnaces. Two-stage models modulate between low and high fire for quieter, more even, and more efficient heating, and this exchanger is designed to handle that dual-stage combustion while safely transferring heat to the supply airstream and containing flue gases.
Common failure symptoms: A worn two-stage heat exchanger may show cracks or corrosion, an erratic flame that shifts as the furnace changes stages, soot or scorching, repeated limit-switch or flame-sensor trips, unusual odors, and the risk of carbon monoxide leakage. Any of these warrant prompt replacement.
Why OEM matters: Two-stage furnaces depend on precise burner and exchanger geometry to stage correctly. The authentic Lennox 14D79 guarantees exact fit, proper heat transfer across both firing rates, and full compliance with the furnace's original safety listing. Generic parts can disrupt staging, reduce efficiency, and void warranty coverage. Choose genuine OEM to keep your Lennox system running as designed.