{"product_id":"oem-lennox-replacement-heat-exchanger-lb-65729b-43j42","title":"OEM Lennox Replacement Heat Exchanger LB-65729B — 43J42","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e43J42\u003c\/strong\u003e (superseding LB-65729B) is a factory replacement heat exchanger component engineered for reliable, efficient heat transfer within your Lennox furnace. It is manufactured to the original specifications so combustion heat moves cleanly into the air stream while flue gases stay properly contained and vented.\u003c\/p\u003e\u003cp\u003eSigns that this part needs replacement include visible cracking, corrosion or scaling, an unstable or discolored burner flame, soot accumulation, odd odors during heating, and abnormal carbon monoxide readings — a clear indication the component is no longer safe or effective.\u003c\/p\u003e\u003cp\u003eUsing the OEM Lennox \u003cstrong\u003e43J42\u003c\/strong\u003e ensures an exact fit and correct performance for your equipment. Heat exchanger components are held to tight combustion-safety and dimensional tolerances, and aftermarket alternatives can compromise fit, efficiency, and safety while voiding your warranty. This is the correct factory part for a proper, code-compliant repair.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081066692979,"sku":"LNX-43J42","price":39.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-replacement-heat-exchanger-lb-65729b-43j42","provider":"National HVAC Parts","version":"1.0","type":"link"}