OEM Lennox Heat Exchanger Kit — 15M11

The Lennox 15M11 is a genuine OEM heat exchanger kit that supplies the heat exchanger and matched components required to transfer combustion heat into your home's airstream while keeping flue gases sealed away from it. Supplied to Lennox specifications, the kit ensures the replacement seats correctly against the burner assembly and restores the furnace's designed heat-transfer performance.

Common failure symptoms: Cracking, rust-through, and metal fatigue are typical signs a heat exchanger needs replacing. You may also notice a burner flame that shifts when the blower engages, soot deposits, a persistent odor during heat cycles, or repeated high-limit lockouts and short-cycling. Since a breach can allow carbon monoxide into the home, replacement should not be postponed.

Why OEM matters: The 15M11 kit includes the correct hardware and gaskets engineered for your Lennox furnace, so everything fits and seals as the factory intended and the unit runs at its certified efficiency. Non-OEM kits can introduce fit and sealing problems and jeopardize warranty coverage. Choose the genuine Lennox kit for a complete, reliable repair.