{"product_id":"oem-lennox-heat-exchanger-assembly-57m94","title":"OEM Lennox Heat Exchanger Assembly — 57M94","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e57M94\u003c\/strong\u003e heat exchanger assembly is the heart of your Lennox gas furnace's heating operation. As combustion gases pass through its internal passages, heat is transferred to the circulating air while dangerous flue byproducts remain fully contained. This separation of heated air from combustion gases is what makes the heat exchanger both a performance and a life-safety component.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms\u003c\/strong\u003e include cracks, corrosion, or rust on the exchanger surfaces, a burner flame that flutters when the blower engages, soot deposits, strange smells during heating cycles, and a tripped carbon monoxide detector. Any of these signs warrants immediate inspection and replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The Lennox \u003cstrong\u003e57M94\u003c\/strong\u003e is built to the precise metallurgy, wall thickness, and dimensional standards required by your specific furnace model. Generic replacements often fail to seal correctly or crack under thermal stress, risking carbon monoxide leaks and voiding manufacturer warranties. Choosing the factory OEM assembly guarantees a proper fit, rated AFUE efficiency, and dependable, safe heating for years to come.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081075409267,"sku":"LNX-57M94","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-57m94","provider":"National HVAC Parts","version":"1.0","type":"link"}