{"product_id":"oem-lennox-secondary-heat-exchanger-r40654-008-80m50","title":"OEM Lennox Secondary Heat Exchanger (R40654-008) — 80M50","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e80M50\u003c\/strong\u003e secondary heat exchanger (factory reference R40654-008) is the condensing-stage component found in high-efficiency Lennox furnaces. Positioned downstream of the primary exchanger, it extracts additional heat from the flue gases until moisture condenses out — the process that lets modern Lennox units reach 90%+ AFUE ratings. This assembly is built to the corrosion-resistant specification required to handle acidic condensate over years of service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A failing secondary exchanger commonly presents as condensate leaks, white residue or corrosion around the coil, reduced heating efficiency, furnace lockouts on pressure-switch or flame faults, or a carbon monoxide alarm. Because this exchanger routinely contacts acidic condensate, pinhole corrosion is a frequent cause of failure and warrants prompt replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The \u003cstrong\u003e80M50\u003c\/strong\u003e is manufactured from the specific corrosion-resistant materials and to the exact geometry Lennox's condensing design demands. Only the genuine OEM part guarantees proper condensate drainage, sealed venting, and the high-efficiency performance your furnace was rated for — while preserving warranty coverage. Choose the factory-original component for safe, efficient condensing operation.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081075638643,"sku":"LNX-80M50","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-secondary-heat-exchanger-r40654-008-80m50","provider":"National HVAC Parts","version":"1.0","type":"link"}