OEM Lennox Heat Exchanger Assembly — 28J70

Genuine OEM Lennox 28J70 heat exchanger assembly. This part transfers combustion heat to the air moving through your Lennox furnace while maintaining a sealed barrier that keeps flue gases separate from your home's air supply. Produced to exact factory tolerances and metallurgy, the 28J70 is a direct replacement that restores your furnace's original heating output and safety performance.

Common failure symptoms: Warning signs of a failing heat exchanger include visible cracks or corrosion, rust flakes near the burner assembly, a flame that flickers or shifts color when the blower runs, soot and scorch marks, unusual odors, and repeated trips of the rollout or high-limit safety switches. Because a cracked exchanger can allow carbon monoxide into the airstream, prompt replacement is critical.

Why OEM matters: Lennox furnaces are engineered around the precise shape, alloy, and airflow profile of their factory heat exchangers. A genuine 28J70 assembly ensures a correct fit, a proper combustion seal, and ongoing compliance with the safety and efficiency ratings of your system. OEM parts protect your warranty and deliver the dependable, long-lasting performance you expect from Lennox.