{"product_id":"oem-lennox-heat-exchanger-assembly-14j99","title":"OEM Lennox Heat Exchanger Assembly — 14J99","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e14J99\u003c\/strong\u003e heat exchanger assembly is the core combustion component in your Lennox gas furnace. It transfers heat from the burning fuel to the circulating air stream while keeping toxic combustion gases safely separated from the air your home breathes. This assembly is engineered to the exact dimensions and metallurgy specified by Lennox, ensuring proper airflow, correct firing rate, and a precise fit into the furnace cabinet.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e Cracked or corroded heat exchangers often produce visible rust flakes, a flickering or yellow burner flame, soot buildup, unusual popping or rumbling on ignition, and in severe cases carbon monoxide detector alarms. A failing exchanger may also cause the flame sensor or limit switch to trip and short-cycle the furnace.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e A heat exchanger is a safety-critical part. Only the OEM Lennox \u003cstrong\u003e14J99\u003c\/strong\u003e guarantees the wall thickness, weld integrity, and clearances that meet Lennox factory specifications and preserve your equipment warranty. Aftermarket substitutes risk improper sealing and premature cracking. Always have a licensed HVAC technician perform the replacement.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081064366451,"sku":"LNX-14J99","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-14j99","provider":"National HVAC Parts","version":"1.0","type":"link"}