{"product_id":"oem-lennox-heat-exchanger-assembly-21w93","title":"OEM Lennox Heat Exchanger Assembly — 21W93","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e21W93\u003c\/strong\u003e heat exchanger assembly is the core component that separates combustion gases from the air circulating through your home. As the burners fire, the \u003cstrong\u003e21W93\u003c\/strong\u003e transfers heat to the airstream while safely venting exhaust, making it one of the most critical safety and efficiency parts in your Lennox gas furnace.\u003c\/p\u003e\u003cp\u003eA failing heat exchanger often shows up as visible cracks or rust, a flickering or lifting burner flame, soot buildup, unusual odors, or a furnace that repeatedly shuts down on a tripped limit or flame sensor. Because a compromised exchanger can allow carbon monoxide to enter the supply air, prompt replacement is essential rather than optional.\u003c\/p\u003e\u003cp\u003eChoosing OEM matters here more than anywhere else in the furnace. The Lennox \u003cstrong\u003e21W93\u003c\/strong\u003e is engineered to the exact metallurgy, wall thickness, and geometry of your original assembly, ensuring proper flame containment, rated combustion efficiency, and a correct fit against the burner box and collector. Aftermarket substitutes can shift heat distribution and void your Lennox warranty. Install this authentic OEM assembly to restore safe, reliable, factory-rated performance.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081073213811,"sku":"LNX-21W93","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-21w93","provider":"National HVAC Parts","version":"1.0","type":"link"}