{"product_id":"oem-lennox-heat-exchanger-assembly-612989-26-13x20","title":"OEM Lennox Heat Exchanger Assembly (612989-26) — 13X20","description":"\u003cp\u003eThis genuine OEM Lennox \u003cstrong\u003e13X20\u003c\/strong\u003e heat exchanger assembly (factory reference 612989-26) is the primary heating element of your Lennox gas furnace, absorbing heat from the burners and passing it into the circulating air while containing the combustion byproducts. Built to the same specifications as the original equipment, the \u003cstrong\u003e13X20\u003c\/strong\u003e drops directly into the compatible Lennox furnace models for a precise, no-modification fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e Watch for hairline cracks, corrosion or scaling on the metal, a burner flame that flutters or changes shape when the blower starts, carbon-monoxide detector activity, or short cycling caused by the high-limit switch tripping. Any of these indicate the exchanger may no longer be sealing combustion gases from the supply air.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e A furnace heat exchanger operates under repeated thermal expansion and high heat, so the exact alloy, gauge thickness, and welded seams matter enormously for both durability and safety. Choosing the authentic Lennox \u003cstrong\u003e13X20\u003c\/strong\u003e assembly ensures certified combustion integrity, correct fit against the burner and inducer assemblies, and full compatibility with your system's efficiency rating and warranty.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081071116659,"sku":"LNX-13X20","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-612989-26-13x20","provider":"National HVAC Parts","version":"1.0","type":"link"}