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 Lennox 14D74 (also identified as 612998-23) is a genuine OEM heat exchanger assembly that transfers heat from the burners to the air passing through your furnace while keeping combustion gases safely separated from the airstream. Built to Lennox factory specifications, it provides the exact fit and heat-transfer surface required for safe, efficient, code-compliant operation.
Common failure symptoms: Typical warning signs include visible cracks or rust, a burner flame that flutters or shifts when the blower runs, soot buildup, odd smells during heat cycles, and frequent high-limit trips or short-cycling. Because a cracked heat exchanger can allow carbon monoxide into the home, it should be replaced promptly for safety.
Why OEM matters: The 14D74 is manufactured to Lennox's original tolerances, ensuring it aligns precisely with the burner box, gaskets, and mounting hardware and preserves the combustion performance your furnace was certified for. Generic replacements risk poor sealing, disrupted airflow, and voided warranty coverage. Installing the genuine OEM assembly guarantees a safe, reliable, factory-correct repair.