{"product_id":"oem-lennox-heat-exchanger-assembly-10a55","title":"OEM Lennox Heat Exchanger Assembly — 10A55","description":"\u003cp\u003eThe Lennox \u003cstrong\u003e10A55\u003c\/strong\u003e is a genuine OEM heat exchanger assembly (factory references 605996-77 and 612224-04) designed for Lennox gas furnaces. This component transfers combustion heat to the air moving through your furnace while forming a sealed barrier that keeps flue gases and carbon monoxide out of your home's air supply. Built to Lennox specifications, it delivers the correct heat transfer surface area and airflow characteristics your furnace was engineered around.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e Watch for visible cracks, rust, or scaling on the exchanger cells, a burner flame that distorts or rolls out when the blower engages, soot deposits, popping or rumbling noises during heating cycles, and frequent lockouts on the high-limit switch. A tripped carbon monoxide alarm is the most serious warning sign and demands immediate attention.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e As a combustion and safety part, the heat exchanger must match your furnace exactly. The genuine Lennox \u003cstrong\u003e10A55\u003c\/strong\u003e is produced to precise factory tolerances for metallurgy, sealing surfaces, and pressure integrity — guaranteeing a leak-free installation and full rated efficiency. Generic replacements can compromise the combustion seal and put your household at risk, so always choose the authentic Lennox assembly.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081071935859,"sku":"LNX-10A55","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-10a55","provider":"National HVAC Parts","version":"1.0","type":"link"}