{"product_id":"oem-lennox-heat-exchanger-74w08-r48077-010","title":"OEM Lennox Heat Exchanger — 74W08 (R48077-010)","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e74W08\u003c\/strong\u003e heat exchanger (interchange R48077-010) is the core combustion component of your Lennox gas furnace. It transfers heat from the burning fuel to the circulating air stream while keeping combustion byproducts safely separated from the air your family breathes. This factory assembly is engineered to the exact tolerances of your Lennox unit for proper airflow, rated efficiency, and long service life.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A failing heat exchanger often shows visible cracks or rust, a flickering or shifting burner flame, unusual odors, soot buildup, or a furnace that repeatedly trips the flame sensor or limit switch on high heat. Because cracks can leak carbon monoxide, a compromised heat exchanger should never be ignored.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox furnaces are built around precise heat-exchanger geometry and metallurgy. Installing the OEM \u003cstrong\u003e74W08\u003c\/strong\u003e ensures correct fit, safe combustion clearances, and preserves your equipment warranty — something aftermarket substitutes rarely guarantee. Restore safe, efficient heating with the exact part your Lennox system was designed for.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081068364147,"sku":"LNX-74W08","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-74w08-r48077-010","provider":"National HVAC Parts","version":"1.0","type":"link"}