{"product_id":"oem-lennox-secondary-heat-exchanger-assembly-80m47","title":"OEM Lennox Secondary Heat Exchanger Assembly — 80M47","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e80M47\u003c\/strong\u003e is a secondary heat exchanger assembly (also referenced as R20539401) used in high-efficiency condensing gas furnaces. The secondary heat exchanger extracts additional heat from the flue gases after they leave the primary cell, condensing water vapor to boost AFUE efficiency and lower fuel costs. It is a critical safety and performance component that keeps combustion byproducts separated from the conditioned air stream in your home.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e Watch for visible cracks or corrosion, water leaks around the furnace base, rust flakes, unusual flame movement when the blower runs, soot buildup, or a furnace that repeatedly trips on a safety limit or pressure switch. A compromised heat exchanger can allow combustion gases to mix with supply air, making prompt replacement essential.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox condensing furnaces are engineered to exacting tolerances, and the \u003cstrong\u003e80M47\u003c\/strong\u003e is built from the specified stainless-steel alloys with the correct pass geometry and gasketing to seal properly and resist condensate corrosion. An OEM assembly ensures a precise fit, maintains rated efficiency, and protects both your warranty and your family's safety. Aftermarket substitutes rarely match the metallurgy or dimensions required for reliable long-term operation.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081076687219,"sku":"LNX-80M47","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-secondary-heat-exchanger-assembly-80m47","provider":"National HVAC Parts","version":"1.0","type":"link"}