{"product_id":"oem-lennox-heat-exchanger-assembly-14k71","title":"OEM Lennox Heat Exchanger Assembly — 14K71","description":"\u003cp\u003eThe Lennox \u003cstrong\u003e14K71\u003c\/strong\u003e is a genuine OEM heat exchanger assembly (factory reference 612983-12) engineered for Lennox gas furnaces. This part is where combustion heat is transferred into the air stream that warms your home, while its sealed cells keep flue gases and carbon monoxide safely isolated from indoor air. Produced to exact Lennox specifications, the 14K71 delivers the proper heat transfer area, airflow, and structural integrity your furnace relies on for safe, efficient operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A deteriorating heat exchanger typically shows visible cracks, rust, or scaling, a burner flame that dances or rolls out when the blower starts, soot buildup, popping or rumbling noises during heating cycles, and recurring high-limit lockouts. The most urgent warning is a carbon monoxide alarm — if it sounds, shut the furnace down and have the exchanger inspected right away.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Because a heat exchanger directly affects combustion safety, only the genuine Lennox \u003cstrong\u003e14K71\u003c\/strong\u003e will do. OEM parts are built to the precise tolerances, alloy, and pressure ratings of the original component, ensuring a tight seal, correct airflow, and full rated efficiency. Non-OEM substitutes risk poor sealing and hazardous leaks, so always install the factory-authentic Lennox assembly.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081072001395,"sku":"LNX-14K71","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-14k71","provider":"National HVAC Parts","version":"1.0","type":"link"}