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 19A77 aluminized heat exchanger assembly is a critical combustion component built to move heat from the burners into the airflow of your Lennox gas furnace. Its aluminized-steel construction resists oxidation and scaling under repeated heating and cooling cycles, delivering long service life while keeping flue gases isolated from the conditioned air in your home.
Common failure symptoms: Watch for rust streaks or cracks along the exchanger cells, a yellow or wavering burner flame, soot buildup, unusual expansion noises during heat-up, or a carbon monoxide alarm. A breached heat exchanger allows combustion gases to mix with supply air, making prompt replacement essential for safety.
Why OEM matters: The 19A77 is formed to Lennox's exact cell geometry and alloy specification so it expands, seals, and vents precisely as the furnace was designed to. Genuine OEM parts protect your rated efficiency, maintain proper flame characteristics, and preserve manufacturer warranty coverage — advantages generic replacements cannot reliably provide. Choose the factory part for safe, dependable heating.