{"product_id":"oem-lennox-burner-box-81k79","title":"OEM Lennox Burner Box — 81K79","description":"\u003cp\u003eThe Lennox \u003cstrong\u003e81K79\u003c\/strong\u003e burner box (factory part number LB-84511) is a genuine OEM combustion enclosure for compatible Lennox furnaces. The burner box houses and positions the burner assembly, maintains proper alignment to the heat exchanger, and helps direct combustion air and flame for safe, efficient, and complete fuel burn. Its precise construction is essential to correct flame containment and airflow through the combustion chamber.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A corroded, cracked, or warped burner box can lead to noisy or unstable combustion, flame rollout, delayed ignition, sooting, poor heat transfer, and nuisance safety lockouts. Rust and heat fatigue over years of cycling are the most common reasons the box needs replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Combustion components must fit and align exactly to keep the flame properly contained and the heat exchanger protected. The OEM Lennox \u003cstrong\u003e81K79\u003c\/strong\u003e is built to the original dimensions and material specifications of your furnace — generic substitutes can misalign the burners, disrupt airflow, and create safety and efficiency problems. Choose the genuine part for a correct, lasting repair. In stock and ready to ship same day.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081131016563,"sku":"LNX-81K79","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-81K79.jpg?v=1783759587","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-burner-box-81k79","provider":"National HVAC Parts","version":"1.0","type":"link"}