{"product_id":"oem-lennox-heat-exchanger-assembly-28j74","title":"OEM Lennox Heat Exchanger Assembly — 28J74","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e28J74\u003c\/strong\u003e heat exchanger assembly is the heart of your Lennox furnace's heating cycle. It absorbs heat from the burners and combustion process and transfers it to the air circulating through your ductwork, all while keeping toxic combustion byproducts sealed and safely vented outside. Built to Lennox factory specifications, it drops in as a direct replacement with the correct dimensions and metallurgy for your unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e Watch for visible cracks or corrosion, a distorted or yellow burner flame, soot or scorch marks, strange smells during operation, or higher-than-normal heating bills. Because a compromised heat exchanger can leak carbon monoxide, any suspected crack warrants immediate replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e As a safety-critical part, the heat exchanger must match your furnace precisely. The OEM \u003cstrong\u003e28J74\u003c\/strong\u003e guarantees proper fit, certified combustion containment, and rated heating efficiency — protecting both your equipment warranty and your household's safety in a way generic substitutes cannot.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081071444339,"sku":"LNX-28J74","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-28j74","provider":"National HVAC Parts","version":"1.0","type":"link"}