{"product_id":"oem-lennox-heat-exchanger-assembly-53k76","title":"OEM Lennox Heat Exchanger Assembly — 53K76","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e53K76\u003c\/strong\u003e heat exchanger assembly is the core combustion component of your Lennox gas furnace, transferring heat from burning fuel to the circulating air stream while keeping combustion gases safely separated from your home's air. This factory assembly is engineered to the exact tolerances of your Lennox furnace for proper airflow, correct temperature rise, and reliable long-term 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, flickering or wavering burner flames when the blower engages, soot buildup, a persistent smell of combustion, or a carbon monoxide detector alarm. Any of these warrant immediate replacement, as a compromised heat exchanger is a serious safety hazard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Because the heat exchanger is a life-safety component, aftermarket substitutes are risky — dimensional or metallurgical differences can cause improper flame patterns, premature cracking, or CO leakage. The OEM \u003cstrong\u003e53K76\u003c\/strong\u003e is built from the correct alloy and geometry to meet Lennox factory specifications and maintain your furnace's safety certification and efficiency rating.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081071247731,"sku":"LNX-53K76","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-53k76","provider":"National HVAC Parts","version":"1.0","type":"link"}