{"product_id":"oem-lennox-heat-exchanger-78w81","title":"OEM Lennox Heat Exchanger — 78W81","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e78W81\u003c\/strong\u003e heat exchanger is the heat-transfer core of your Lennox gas furnace. It moves heat from the combustion chamber into your home's circulating air while containing flue gases within a sealed passage, making it essential to both the efficiency and the safe operation of the furnace. Built to original Lennox specifications, it ensures the proper temperature rise and airflow your system was designed to deliver.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e Signs of a failing exchanger include a burner flame that flickers or shifts when the blower engages, rust or corrosion, visible cracks or pinholes, soot buildup, a burning smell during operation, and frequent tripping of the limit or flame-rollout switches. Because a cracked heat exchanger can leak carbon monoxide into the airstream, prompt replacement is critical for safety.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The heat exchanger is a combustion-sealed, safety-critical part where exact fit and material quality cannot be compromised. The genuine Lennox \u003cstrong\u003e78W81\u003c\/strong\u003e matches the factory unit's dimensions, alloy, and weld integrity to guarantee a leak-tight seal and preserve your warranty. Choose the OEM part for a safe, dependable, long-lasting repair.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081064333683,"sku":"LNX-78W81","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-78w81","provider":"National HVAC Parts","version":"1.0","type":"link"}