{"product_id":"oem-lennox-heat-exchanger-assembly-14d74","title":"OEM Lennox Heat Exchanger Assembly — 14D74","description":"\u003cp\u003eThe Lennox \u003cstrong\u003e14D74\u003c\/strong\u003e (also identified as 612998-23) is a genuine OEM heat exchanger assembly that transfers heat from the burners to the air passing through your furnace while keeping combustion gases safely separated from the airstream. Built to Lennox factory specifications, it provides the exact fit and heat-transfer surface required for safe, efficient, code-compliant operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e Typical warning signs include visible cracks or rust, a burner flame that flutters or shifts when the blower runs, soot buildup, odd smells during heat cycles, and frequent high-limit trips or short-cycling. Because a cracked heat exchanger can allow carbon monoxide into the home, it should be replaced promptly for safety.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The \u003cstrong\u003e14D74\u003c\/strong\u003e is manufactured to Lennox's original tolerances, ensuring it aligns precisely with the burner box, gaskets, and mounting hardware and preserves the combustion performance your furnace was certified for. Generic replacements risk poor sealing, disrupted airflow, and voided warranty coverage. Installing the genuine OEM assembly guarantees a safe, reliable, factory-correct repair.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081067184499,"sku":"LNX-14D74","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-14d74","provider":"National HVAC Parts","version":"1.0","type":"link"}