{"product_id":"oem-lennox-heat-exchanger-assembly-13x38","title":"OEM Lennox Heat Exchanger Assembly — 13X38","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e13X38\u003c\/strong\u003e heat exchanger assembly (factory reference 612218-44) is the core combustion component of your Lennox gas furnace. It transfers heat from the burned fuel to the circulating air while keeping combustion byproducts safely separated from your home's air supply. This assembly is engineered to the exact dimensions, alloy, and weld specifications of the original part to maintain proper airflow, ignition sequencing, and rated efficiency.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms\u003c\/strong\u003e include visible cracks or rust on the exchanger surface, a flickering or rolling burner flame, soot buildup, a rumbling or booming sound at startup, and elevated carbon monoxide readings. A compromised heat exchanger is a serious safety concern and should be replaced promptly by a qualified technician.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox furnaces are calibrated around the precise metallurgy and geometry of their factory heat exchangers. An OEM \u003cstrong\u003e13X38\u003c\/strong\u003e ensures correct heat transfer, safe flue gas containment, and continued warranty compliance — advantages generic aftermarket parts cannot guarantee. In stock and ships same day before 3PM CST.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081074884979,"sku":"LNX-13X38","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-13x38","provider":"National HVAC Parts","version":"1.0","type":"link"}