{"product_id":"oem-lennox-heat-exchanger-assembly-45k78","title":"OEM Lennox Heat Exchanger Assembly — 45K78","description":"\u003cp\u003eThe Lennox \u003cstrong\u003e45K78\u003c\/strong\u003e is a genuine OEM heat exchanger assembly that captures heat produced by the burners and transfers it to the circulating air while containing the products of combustion. Designed specifically for your Lennox furnace, it maintains the correct airflow path, burner clearances, and heat-transfer surface area needed for safe, efficient operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e Watch for cracked or rusted sections, a burner flame that flutters or changes shape when the blower starts, soot or scorch marks, strange smells during heating, and frequent limit-switch trips or short-cycling. A cracked heat exchanger can release carbon monoxide into the living space, making prompt replacement essential for household safety.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The \u003cstrong\u003e45K78\u003c\/strong\u003e is built to Lennox factory tolerances, ensuring an exact fit against the burner box, gaskets, and mounting hardware and preserving the combustion performance your furnace was certified for. Generic replacements risk poor sealing, disrupted airflow, and voided warranties. Installing the authentic OEM assembly delivers a dependable, code-correct repair.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081067020659,"sku":"LNX-45K78","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-45k78","provider":"National HVAC Parts","version":"1.0","type":"link"}