{"product_id":"oem-lennox-heat-exchanger-assembly-12y81","title":"OEM Lennox Heat Exchanger Assembly — 12Y81","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e12Y81\u003c\/strong\u003e heat exchanger assembly (superseding \u003cstrong\u003e614580-03\u003c\/strong\u003e, formerly 612218-41) is the primary combustion and heat-transfer component in compatible Lennox gas furnaces. It draws heat from the burner flames and releases it into the air stream while keeping flue gases fully sealed from the air circulated through your home. Every dimension, weld, and tube pattern is matched to your Lennox model to preserve correct airflow and rated efficiency.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A worn or cracked heat exchanger typically reveals itself through rust and soot deposits, a flame that flutters or rolls out when the blower starts, metallic popping or booming on ignition, diminished heat output, and short cycling on the limit switch. A crack can allow carbon monoxide to mix into your indoor air, so any visible crack or CO detector alarm demands immediate shutdown and replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters for Lennox:\u003c\/strong\u003e Because the exchanger defines both combustion performance and the sealed barrier protecting your family, it must match the furnace exactly. The factory \u003cstrong\u003e12Y81\u003c\/strong\u003e part guarantees proper fit, Lennox-rated heat transfer, and code and warranty compliance that universal substitutes cannot match. Install genuine OEM for safe, efficient, worry-free heating.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081070854515,"sku":"LNX-12Y81","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-12y81","provider":"National HVAC Parts","version":"1.0","type":"link"}