{"product_id":"oem-lennox-furnace-heat-exchanger-assembly-13x40","title":"OEM Lennox Furnace Heat Exchanger Assembly — 13X40","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e13X40\u003c\/strong\u003e heat exchanger assembly (factory part 612224-41) is the primary heat-transfer component in your Lennox gas furnace. As the burners fire, this assembly absorbs combustion heat and passes it to the blower-driven air stream while containing flue gases within its sealed tubes. It is built to the precise dimensions and alloy of the original Lennox part for a drop-in fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e Age, thermal cycling, and condensation can lead to cracked or perforated heat-exchanger walls. Look for a distorted or flickering flame when the blower engages, rust flakes or soot, strange smells during heating, nuisance limit-switch shutdowns, and any elevated carbon monoxide detection. These are signals to replace the exchanger without delay.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The heat exchanger is central to both efficiency and safety. Installing the authentic Lennox \u003cstrong\u003e13X40\u003c\/strong\u003e ensures correct burner-to-tube alignment, rated heat transfer, and adherence to the furnace's original safety certification. Aftermarket look-alikes risk airflow problems, warranty loss, and combustion hazards. Trust genuine OEM for this critical repair.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081070657907,"sku":"LNX-13X40","price":399.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-furnace-heat-exchanger-assembly-13x40","provider":"National HVAC Parts","version":"1.0","type":"link"}