{"product_id":"oem-lennox-heat-exchanger-assembly-54j42","title":"OEM Lennox Heat Exchanger Assembly — 54J42","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e54J42\u003c\/strong\u003e heat exchanger assembly is the heart of your Lennox gas furnace, transferring combustion heat to the circulating air stream while keeping flue gases safely separated from the air you breathe. Engineered to exact factory tolerances, it restores your furnace to its original rated efficiency and heating capacity.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A failing heat exchanger often reveals itself through visible cracks or rust, a flickering or wavering burner flame, a persistent smell of combustion, soot buildup, or a carbon monoxide detector alarm. Any of these signs means the exchanger should be replaced immediately for the safety of your household.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The heat exchanger is a safety-critical component. Because it directly separates toxic combustion byproducts from your home's air, only a genuine Lennox \u003cstrong\u003e54J42\u003c\/strong\u003e guarantees the precise metallurgy, weld integrity, and dimensional fit your furnace was certified with. Aftermarket substitutes can compromise combustion clearances and void your warranty. Choose OEM for peace of mind and a proper, lasting repair.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081073574259,"sku":"LNX-54J42","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-54j42","provider":"National HVAC Parts","version":"1.0","type":"link"}