{"product_id":"oem-lennox-heat-exchanger-assembly-r48077004-99m79","title":"OEM Lennox Heat Exchanger Assembly (R48077004) — 99M79","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e99M79\u003c\/strong\u003e heat exchanger assembly (factory reference R48077004) is the primary heat-transfer surface inside your Lennox gas furnace. As the burners fire, this component absorbs combustion heat and passes it to the blower-driven air stream while containing flue gases within a sealed path. It is built to Lennox's precise specifications so airflow, temperature rise, and efficiency stay within the furnace's rated design.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e Watch for a distorted or wavering burner flame, popping or rumbling on ignition, rust or metallic flaking, cracks along the weld seams, or a furnace that repeatedly trips on its high-limit switch. Any breach in the exchanger can leak carbon monoxide into the supply air, so failure should be addressed immediately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e A heat exchanger is a safety-critical combustion part, and only the genuine Lennox \u003cstrong\u003e99M79\u003c\/strong\u003e delivers the exact metallurgy, sealing, and dimensional fit your furnace requires. Non-OEM alternatives risk poor sealing, reduced life, warranty loss, and unsafe combustion. Install the factory part to restore reliable, efficient, and safe heating.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081067577715,"sku":"LNX-99M79","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-r48077004-99m79","provider":"National HVAC Parts","version":"1.0","type":"link"}