{"product_id":"oem-lennox-heat-exchanger-assembly-18w73","title":"OEM Lennox Heat Exchanger Assembly — 18W73","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e18W73\u003c\/strong\u003e heat exchanger assembly (factory reference LB-94782AA) transfers heat from the burner combustion process into your home's circulating air while safely isolating flue gases. Engineered to exact Lennox specifications, it provides the correct fit, metal gauge, and airflow path needed for rated furnace efficiency and dependable, safe heating.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e visible cracks or corrosion, rust flakes, soot buildup, flame rollout at the burners, a burner flame that distorts when the blower runs, odd smells during a heating cycle, or a carbon monoxide alarm. A failing heat exchanger is a safety hazard and warrants immediate replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e As a safety-critical component, the heat exchanger must match factory tolerances precisely. The genuine Lennox \u003cstrong\u003e18W73\u003c\/strong\u003e uses the specified alloy and welds to resist cracking through years of thermal expansion and contraction while holding a sealed combustion boundary. Generic substitutes can leak, fit poorly, and void your warranty. Choose factory OEM for a safe, long-lasting repair.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081064661363,"sku":"LNX-18W73","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-18w73","provider":"National HVAC Parts","version":"1.0","type":"link"}