{"product_id":"oem-lennox-heat-exchanger-assembly-33w33","title":"OEM Lennox Heat Exchanger Assembly — 33W33","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e33W33\u003c\/strong\u003e heat exchanger assembly is the heart of your furnace's heating process, capturing heat from combustion and passing it to the air moving through your ductwork — all while sealing combustion byproducts safely away from your indoor air. It is manufactured to precise Lennox tolerances for dependable, efficient performance.\u003c\/p\u003e\u003cp\u003eWarning signs of a worn or cracked heat exchanger include visible corrosion or hairline cracks, a yellow or wavering burner flame, soot accumulation, strange odors, and in serious cases a tripped carbon monoxide alarm. Because these failures directly affect safety, the \u003cstrong\u003e33W33\u003c\/strong\u003e should be replaced without delay when symptoms appear.\u003c\/p\u003e\u003cp\u003eOEM is essential for a part this critical. Aftermarket substitutes rarely match the exact metallurgy, weld quality, and dimensions required for a leak-free seal in your Lennox furnace. The factory \u003cstrong\u003e33W33\u003c\/strong\u003e guarantees correct fit, proper airflow, and continued warranty compliance, giving you confidence that your system runs safely and at its designed efficiency.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081076064627,"sku":"LNX-33W33","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-33w33","provider":"National HVAC Parts","version":"1.0","type":"link"}