{"product_id":"oem-lennox-heat-exchanger-assembly-50m77","title":"OEM Lennox Heat Exchanger Assembly — 50M77","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e50M77\u003c\/strong\u003e heat exchanger assembly — also referenced as R20467605 — is the essential combustion and heat-transfer component of your Lennox gas furnace. It carries heat from the burners into your home's air stream while containing carbon monoxide and other flue gases so they vent safely outdoors. Produced to Lennox factory tolerances, it maintains precise burner alignment and the furnace's rated heating efficiency.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e Cracks, rust, or perforations in the exchanger surfaces, a flame that flickers or rolls out when the blower starts, soot accumulation, unusual odors during heating cycles, or a carbon monoxide detector tripping while the furnace runs. These are indicators that the heat exchanger has failed and needs immediate replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The specific alloy, weld pattern, and combustion geometry of the \u003cstrong\u003e50M77\u003c\/strong\u003e are engineered to keep exhaust gases sealed away from your indoor air. Confirm the cross-reference R20467605 against your unit for an exact match. Genuine OEM parts protect combustion safety, preserve your warranty, and restore full efficiency. In stock and ready to ship same day.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081065316723,"sku":"LNX-50M77","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-50m77","provider":"National HVAC Parts","version":"1.0","type":"link"}