OEM Lennox Heat Exchanger Assembly — 28M87

The genuine OEM Lennox 28M87 heat exchanger assembly (also cataloged as LB-94782P) is the primary heat-transfer component in your Lennox gas furnace. As combustion gases pass through its sealed passages, heat is transferred to the air moving over the exchanger while flue byproducts are safely vented outside. Manufactured to original Lennox specifications, this assembly delivers the exact fit, steel gauge, and burner alignment your furnace was engineered around.

Common failure symptoms: watch for a distorted or lifting burner flame, visible cracks or rust at the exchanger, soot accumulation, a metallic or burning odor during heating cycles, or a furnace that repeatedly short-cycles on flame-sensor faults. A failing heat exchanger can also allow carbon monoxide to enter the airstream, so any of these signs warrants immediate replacement.

Why OEM matters: because the heat exchanger is a combustion-safety part, exact engineering matters. The OEM 28M87 matches Lennox burner geometry and material grade precisely — preserving proper flame behavior, rated efficiency, and warranty coverage that generic replacements cannot guarantee.