{"product_id":"oem-lennox-5-burner-inshot-burner-assembly-18l57","title":"OEM Lennox 5-Burner Inshot Burner Assembly — 18L57","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e18L57\u003c\/strong\u003e inshot burner assembly (factory number 619796-05) is a complete 5-burner rack that delivers gas to the heat exchanger and provides the flame for combustion in compatible Lennox gas furnaces. Each inshot burner directs its flame accurately into the heat-exchanger tube, letting the ignitor establish and the flame sensor prove combustion on every call for heat. The correct factory assembly preserves proper flame geometry, safe operation, and steady furnace output.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e Corroded, warped, or scale-clogged burners can produce delayed ignition, flame rollout, rumbling or popping noises, yellow or lazy flames, short cycling, or lockouts caused by failed flame sense. Cracked ports may also lead to soot and incomplete combustion.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox manufactures the \u003cstrong\u003e18L57\u003c\/strong\u003e to exact port dimensions, spacing, and orifice alignment for its specific 5-burner furnace models. Aftermarket parts can change flame characteristics and jeopardize safe, efficient heating. The factory-specified assembly guarantees correct fit, rated BTU input, and reliable ignition throughout the life of your Lennox furnace.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081128067443,"sku":"LNX-18L57","price":49.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-burner-inshot-LNX-18L57.jpg?v=1783759137","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-5-burner-inshot-burner-assembly-18l57","provider":"National HVAC Parts","version":"1.0","type":"link"}