{"product_id":"oem-lennox-bottom-burner-box-61m18","title":"OEM Lennox Bottom Burner Box — 61M18","description":"\u003cp\u003eThe Lennox \u003cstrong\u003e61M18\u003c\/strong\u003e (factory reference LB-100712A) is the bottom burner box that houses and positions the gas burners inside your Lennox furnace. It provides the correct combustion geometry and airflow path so the burners fire cleanly and direct heat into the heat exchanger safely. This component is a direct OEM replacement for the original bottom burner box assembly.\u003c\/p\u003e\u003cp\u003eA damaged, corroded, or warped burner box can lead to poor flame alignment, incomplete combustion, sooting, delayed ignition, or a furnace that short-cycles on the flame sensor or rollout switch. If you notice yellow or lazy flames, unusual burner noise, or repeated safety lockouts, the burner box may be part of the problem and should be inspected.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox designs the \u003cstrong\u003e61M18\u003c\/strong\u003e to exact combustion tolerances specific to their furnace platforms. Aftermarket or mismatched boxes can disrupt flame travel and airflow, compromising efficiency and safety. Installing the genuine OEM part ensures proper fit, rated performance, and compliance with Lennox specifications.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081128821107,"sku":"LNX-61M18","price":49.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-burner-ribbon-LNX-61M18.jpg?v=1783759512","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-bottom-burner-box-61m18","provider":"National HVAC Parts","version":"1.0","type":"link"}