{"product_id":"oem-goodman-24-1-2-6-cell-heat-exchanger-gmnt120-5d-4821404s","title":"OEM Goodman 24-1\/2\" 6-Cell Heat Exchanger GMNT120-5D — 4821404S","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman 4821404S Heat Exchanger\u003c\/strong\u003e is a genuine OEM 24-1\/2 inch, 6-cell heat exchanger assembly built for the \u003cstrong\u003eGMNT120-5D\u003c\/strong\u003e 120,000 BTU gas furnace. The heat exchanger is the heart of the furnace — combustion gases pass through its cells while blower air passes over them, transferring heat to your home without mixing the airstreams. A cracked or rusted heat exchanger is a serious carbon-monoxide safety hazard and the most common reason for a full-assembly replacement.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: 4821404S\u003c\/li\u003e\n\u003cli\u003eBrand: Goodman\u003c\/li\u003e\n\u003cli\u003eSize: 24-1\/2 inch\u003c\/li\u003e\n\u003cli\u003eConfiguration: 6-cell \/ 6-tube clamshell\u003c\/li\u003e\n\u003cli\u003eEquipment Type: Gas Furnace\u003c\/li\u003e\n\u003cli\u003eCompatible Model: GMNT120-5D\u003c\/li\u003e\n\u003cli\u003eMaterial: Aluminized steel\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThis factory Goodman assembly matches the exact cell count, tube geometry, and mounting flanges of the GMNT120-5D. Generic heat exchangers are effectively unavailable for this application, and any substitution would compromise combustion efficiency and safety certification. OEM is the only recommended option.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eExpert — Professional required.\u003c\/strong\u003e This is a major furnace repair requiring complete teardown of the burner assembly, gas manifold, and blower section, followed by combustion analysis and CO testing. Must be performed by a licensed HVAC technician; many jurisdictions require permitting.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058132173171,"sku":"GOODMAN-11771","price":433.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-24-1-2-6-cell-heat-exchanger-gmnt120-5d-4821404s","provider":"National HVAC Parts","version":"1.0","type":"link"}