{"product_id":"oem-lennox-heat-exchanger-assembly-71l27","title":"OEM Lennox Heat Exchanger Assembly — 71L27","description":"\u003cp\u003eThe OEM Lennox \u003cstrong\u003e71L27\u003c\/strong\u003e heat exchanger assembly is the heart of your Lennox gas furnace's heating cycle. It draws heat from the combustion chamber and passes it to the blower-driven air stream, all while containing flue gases and directing them safely to the vent. Built to Lennox factory tolerances, the \u003cstrong\u003e71L27\u003c\/strong\u003e delivers the correct heat transfer surface area and airflow path your furnace was designed around.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e Watch for hairline cracks, rust or scaling on the exchanger surface, a distorted or lifting burner flame, soot deposits, and rumbling or booming sounds during ignition. Repeated high-limit trips, short cycling, or a triggered CO detector are strong signs the exchanger has failed and needs replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Because the heat exchanger separates combustion byproducts from your indoor air, precision and durability are non-negotiable. The genuine Lennox \u003cstrong\u003e71L27\u003c\/strong\u003e is manufactured with the exact alloy, gauge, and welds that meet Lennox safety and efficiency standards and keep your warranty intact. Installation should always be handled by a qualified HVAC professional.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081064431987,"sku":"LNX-71L27","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-71l27","provider":"National HVAC Parts","version":"1.0","type":"link"}