{"product_id":"oem-goodman-14-in-2-cell-heat-exchanger-for-gmnt040-3-4821400s","title":"OEM Goodman 14 in 2-Cell Heat Exchanger for GMNT040-3 — 4821400S","description":"\u003ch2\u003eGoodman 4821400S 14 in. 2-Cell Heat Exchanger\u003c\/h2\u003e\u003cp\u003eThe Goodman 4821400S is a genuine OEM 14 inch, 2-cell heat exchanger engineered as a direct-fit replacement for Goodman GMNT040-3 gas furnaces and compatible Goodman\/Amana models. The heat exchanger is the heart of the furnace — combustion gases pass through its cells while blower air flows over the outside, transferring heat to your home while keeping flue gases fully separated from the airstream. A cracked or rusted exchanger is a safety hazard that can leak carbon monoxide, so timely OEM replacement is essential.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart number: 4821400S\u003c\/li\u003e\n\u003cli\u003eSize: 14 in., 2-cell (clamshell) design\u003c\/li\u003e\n\u003cli\u003eFits: Goodman GMNT040-3 and compatible furnaces\u003c\/li\u003e\n\u003cli\u003eMaterial: Aluminized steel for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eIncludes: Heat exchanger cell assembly\u003c\/li\u003e\n\u003cli\u003eBrand: Goodman (OEM)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eA heat exchanger is a life-safety component, and this genuine Goodman part is built to the exact cell geometry, metal gauge, and burner alignment of the original. Aftermarket exchangers can vary in weld quality and dimensional tolerance, risking flame impingement, condensation, and premature cracking. For a part that separates you from combustion byproducts, only OEM belongs in the furnace.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eAdvanced (5 of 5).\u003c\/strong\u003e This is a major repair requiring near-complete furnace teardown — burner, gas valve, and blower removal — plus proper burner realignment and combustion verification afterward. This job should be performed only by a licensed HVAC technician, and combustion and CO testing must be completed before returning the furnace to service.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058127454579,"sku":"GOODMAN-11613","price":395.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-14-in-2-cell-heat-exchanger-for-gmnt040-3-4821400s","provider":"National HVAC Parts","version":"1.0","type":"link"}