{"product_id":"oem-lennox-heat-exchanger-assembly-70w08","title":"OEM Lennox Heat Exchanger Assembly — 70W08","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e70W08\u003c\/strong\u003e heat exchanger assembly, cross-referenced as 605731-03 and replacing 604904-05, is a factory-specified heat-transfer component for your Lennox furnace. It captures heat from the burner and delivers it to the blower air stream while safely containing combustion gases away from your indoor air. Manufactured to exact Lennox standards, it provides the correct fit, alloy, and thermal performance for compatible models.\u003c\/p\u003e\u003cp\u003eYears of heating cycles gradually fatigue heat exchanger metal. Indicators that the \u003cstrong\u003e70W08\u003c\/strong\u003e needs replacement include cracks or rust on the cells, a flickering or rolling flame, soot buildup, unusual smells, repeated limit-switch shutdowns, or a tripped carbon monoxide alarm during operation. Because a failed exchanger is a safety concern, replace it without delay.\u003c\/p\u003e\u003cp\u003eOEM matters for the Lennox \u003cstrong\u003e70W08\u003c\/strong\u003e because aftermarket versions rarely match the original engineering, risking reduced efficiency, airflow restriction, and premature failure. This factory part restores safe, efficient heat and keeps your Lennox furnace performing as intended.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081064825203,"sku":"LNX-70W08","price":39.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-assembly-70w08","provider":"National HVAC Parts","version":"1.0","type":"link"}