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The Lennox 98L30 (LB-99214) Orifice is a genuine OEM replacement part that regulates fuel flow into the burner assembly for safe and efficient combustion in compatible Lennox furnaces and heating systems. Common signs of a failing or obstructed orifice include yellow or flickering burner flames, sooting on the heat exchanger, or reduced heating capacity. This authentic Lennox OEM orifice delivers a precise fit and restores reliable system operation.