{"product_id":"oem-lennox-stainless-steel-heat-exchanger-53k74","title":"OEM Lennox Stainless Steel Heat Exchanger — 53K74","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e53K74\u003c\/strong\u003e stainless steel heat exchanger assembly transfers combustion heat into your home's air stream while keeping flue gases fully sealed away. Its stainless steel construction offers superior resistance to corrosion, thermal fatigue, and cracking, making it an excellent long-life replacement built to exact Lennox factory specifications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e Even durable exchangers can fail over time — look for surface cracks or corrosion, a burner flame that distorts when the blower engages, repeated high-limit or flame-sensor faults, short-cycling, or combustion odors. Any crack can allow carbon monoxide to enter the airstream, so prompt replacement is critical for safety.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e As a safety-critical, pressure-sealed part, only the genuine Lennox \u003cstrong\u003e53K74\u003c\/strong\u003e guarantees the correct stainless alloy, wall thickness, and welded seam integrity your furnace was engineered for. Generic substitutes risk poor sealing, shorter service life, and voided warranty coverage. Choose the OEM stainless assembly for safe, efficient, long-lasting heating performance.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081070362995,"sku":"LNX-53K74","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-stainless-steel-heat-exchanger-53k74","provider":"National HVAC Parts","version":"1.0","type":"link"}