{"product_id":"oem-lennox-heat-exchanger-assembly-11x39","title":"OEM Lennox Heat Exchanger Assembly — 11X39","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e11X39\u003c\/strong\u003e heat exchanger assembly is the core combustion component of your Lennox gas furnace. It transfers heat from the burned fuel to the circulating air stream while keeping combustion gases safely separated from the air you breathe. This assembly is engineered to the exact metallurgy, tube geometry, and mounting specifications of the Lennox furnaces it serves, ensuring proper airflow, rated efficiency, and safe operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A failing heat exchanger often shows up as visible cracks or rust, a flickering or rolling burner flame, soot buildup, unusual odors, or a carbon monoxide detector alarm. You may also notice reduced heat output or a furnace that repeatedly shuts down on its safety limit. Because a cracked heat exchanger can leak combustion byproducts, replacement should never be delayed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Aftermarket heat exchangers rarely match the precise wall thickness, weld pattern, and expansion tolerances of Lennox equipment, which can lead to premature cracking or unsafe operation. Choosing the OEM \u003cstrong\u003e11X39\u003c\/strong\u003e guarantees a factory-correct fit, preserves your Lennox warranty coverage, and restores your furnace to its original safety and efficiency ratings.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081068036467,"sku":"LNX-11X39","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-11x39","provider":"National HVAC Parts","version":"1.0","type":"link"}