{"product_id":"oem-lennox-secondary-heat-exchanger-assembly-80m49","title":"OEM Lennox Secondary Heat Exchanger Assembly — 80M49","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e80M49\u003c\/strong\u003e is a secondary heat exchanger assembly designed for high-efficiency condensing furnaces. In a condensing furnace, the secondary heat exchanger extracts additional heat from the combustion flue gases after they leave the primary exchanger, condensing water vapor and boosting overall efficiency. Precise fit to your Lennox furnace ensures proper combustion sealing and rated AFUE performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e When a secondary heat exchanger corrodes, cracks, or clogs, you may notice reduced heating output, short cycling, a lockout on the furnace control, water leaking around the unit, or the appearance of soot and condensate. A compromised heat exchanger can also allow flue gases to escape, which is a serious carbon monoxide safety concern that warrants immediate replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Heat exchangers are safety-critical, factory-matched components. Only a genuine Lennox \u003cstrong\u003e80M49\u003c\/strong\u003e guarantees the correct alloy, coil geometry, and gasket interfaces required to seal against combustion byproducts and maintain your warranty. Aftermarket substitutes risk improper fit, premature corrosion, and unsafe flue conditions in your Lennox equipment.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081077047667,"sku":"LNX-80M49","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-secondary-heat-exchanger-assembly-80m49","provider":"National HVAC Parts","version":"1.0","type":"link"}