OEM Lennox Heat Exchanger Assembly — 28J72

This genuine OEM Lennox 28J72 heat exchanger assembly is the essential heating component in your Lennox furnace, transferring combustion heat into the supply air while safely containing and venting exhaust gases. Produced to Lennox factory specifications, the 28J72 is a direct-fit replacement engineered to seat correctly against the original burner, inducer, and limit-control assemblies for a clean, reliable installation.

Common failure symptoms: A deteriorating heat exchanger commonly reveals itself through cracks or corrosion in the metal, a burner flame that flickers or bends when the blower engages, sooting, unusual smells, carbon-monoxide alarms, or a furnace that short cycles on its high-limit switch. Each of these signals a potential breach between combustion and living-space air.

Why OEM matters: The heat exchanger endures intense, repeated thermal stress and is critical to safe combustion, so exact metallurgy, seam welds, and dimensional accuracy are non-negotiable. Installing the authentic Lennox 28J72 assures certified sealing integrity, proper component fit, and the sustained efficiency and warranty protection expected from genuine Lennox equipment.