{"product_id":"oem-lennox-heat-exchanger-assembly-14k75","title":"OEM Lennox Heat Exchanger Assembly — 14K75","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e14K75\u003c\/strong\u003e heat exchanger assembly (factory reference 612989-03) is the core heating component of your Lennox gas furnace. It transfers heat from the burner combustion gases to the circulating air stream while keeping toxic flue gases safely separated from the air you breathe. Because it is engineered to exact Lennox specifications, this assembly restores rated heating output and maintains the sealed combustion path your furnace was designed around.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon symptoms of a failing heat exchanger\u003c\/strong\u003e include visible cracks or rust, a flickering or shifting burner flame, soot buildup, unusual odors, and — most seriously — elevated carbon monoxide readings. A cracked heat exchanger is a safety hazard and should be replaced promptly rather than repaired.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e a Lennox heat exchanger is a life-safety part where metallurgy, weld integrity, and dimensional fit are critical. The OEM \u003cstrong\u003e14K75\u003c\/strong\u003e is built to Lennox's material and pressure standards, seals correctly to the burner box and collector, and preserves your furnace warranty and combustion certification. Aftermarket substitutes risk improper fit, premature failure, and dangerous flue leakage.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081073377651,"sku":"LNX-14K75","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-14k75","provider":"National HVAC Parts","version":"1.0","type":"link"}