{"product_id":"oem-goodman-24-1-2-in-6-cell-heat-exchanger-for-gmnt120-5b-4821404s","title":"OEM Goodman 24-1\/2 in 6-Cell Heat Exchanger for GMNT120-5B — 4821404S","description":"\u003ch2\u003eGoodman 4821404S 6-Cell Heat Exchanger\u003c\/h2\u003e\u003cp\u003eThe Goodman \u003cstrong\u003e4821404S\u003c\/strong\u003e is a genuine OEM 24-1\/2 inch, 6-cell heat exchanger engineered as a direct-fit replacement for the \u003cstrong\u003eGMNT120-5B\u003c\/strong\u003e gas furnace. The heat exchanger is the heart of your furnace's combustion system — it transfers heat from burning gas to the circulating air while safely containing exhaust gases. A cracked or corroded heat exchanger is a common cause of failed inspections, carbon-monoxide concerns, and no-heat callbacks, making this one of the most critical components to replace with a factory-spec part.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOverall size: 24-1\/2 inch\u003c\/li\u003e\n\u003cli\u003eConfiguration: 6-cell clamshell design\u003c\/li\u003e\n\u003cli\u003eMaterial: aluminized\/stainless steel construction\u003c\/li\u003e\n\u003cli\u003eFits: Goodman GMNT120-5B furnace (120,000 BTU class)\u003c\/li\u003e\n\u003cli\u003eOEM part number: 4821404S\u003c\/li\u003e\n\u003cli\u003eEquipment type: gas furnace\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThis is a \u003cstrong\u003egenuine OEM Goodman\u003c\/strong\u003e heat exchanger, not an aftermarket universal. Because heat exchangers must precisely match burner spacing, cell geometry, and airflow, we do not recommend generic substitutes for this component. The OEM part guarantees correct combustion clearances, warranty compliance, and long-term corrosion resistance. Generic weld-up exchangers can shift flame patterns and shorten furnace life.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eAdvanced (4\/5).\u003c\/strong\u003e Replacing a heat exchanger requires disassembling the furnace burner box, disconnecting gas and electrical, and recalibrating combustion. This repair should be performed by a licensed HVAC technician, followed by a combustion analysis and CO test before returning the unit to service.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eFits Goodman GMNT120-5B. Verify your model and cell count before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058131845491,"sku":"GOODMAN-11755","price":433.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-24-1-2-in-6-cell-heat-exchanger-for-gmnt120-5b-4821404s","provider":"National HVAC Parts","version":"1.0","type":"link"}