{"product_id":"oem-lennox-heat-exchanger-assembly-13x51","title":"OEM Lennox Heat Exchanger Assembly — 13X51","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e13X51\u003c\/strong\u003e heat exchanger assembly (factory reference 612218-45) is the furnace component that transfers combustion heat into your home's circulating air while safely isolating flue gases. Manufactured to exact Lennox tolerances, it ensures proper airflow, sealing, and efficient, safe heat transfer within your specific furnace model.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e Telltale signs of a failing exchanger include visible cracks or rust, a wavering or discolored burner flame, soot buildup, unusual odors when the furnace runs, or a carbon monoxide detector going off. A compromised heat exchanger can leak dangerous combustion gases and should be replaced right away.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e As a safety-critical part, the exact-fit OEM Lennox \u003cstrong\u003e13X51\u003c\/strong\u003e is the only dependable option. Aftermarket versions may not replicate Lennox metal gauge, weld patterns, or precise dimensions, risking improper combustion, premature failure, and voided warranty coverage. This factory assembly restores rated efficiency and safe operation to your Lennox furnace.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081075933555,"sku":"LNX-13X51","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-13x51","provider":"National HVAC Parts","version":"1.0","type":"link"}