OEM Lennox Heat Exchanger Assembly — 10U90

The genuine OEM Lennox 10U90 heat exchanger assembly (also referenced as R44724004) is the heart of your furnace's heating cycle, transferring combustion heat into the supply air while containing flue gases within a sealed chamber. Manufactured to original Lennox specifications, it delivers the efficiency, airflow characteristics, and safety separation your system was engineered around.

Common failure symptoms: Watch for rust or cracks on the exchanger walls, a rollout or wavering burner flame, sooting, a persistent burning or metallic smell, or frequent high-limit lockouts that cause short cycling. Because a cracked heat exchanger can leak carbon monoxide into your home, any sign of failure warrants immediate attention.

Why OEM matters: As a combustion-side safety component, the heat exchanger must match your Lennox furnace exactly in dimensions, gauge, and alloy. The authentic 10U90 assembly guarantees a correct seal to the burner box and collector, maintains proper heat distribution, and preserves your equipment warranty. Generic replacements risk poor fit, uneven heating, and compromised safety. Insist on OEM Lennox for reliable, code-compliant heating.