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The Lennox 41J81, also referenced as LB-69896, is a genuine OEM orifice with a precise 0.0550 inch bore diameter, engineered to meter the exact volume of fuel required for safe and efficient combustion in compatible Lennox HVAC systems. An incorrect or worn orifice size can cause issues such as improper flame characteristics, inefficient fuel usage, carbon buildup, or failure to maintain consistent burner operation. This direct OEM replacement ensures the correct sizing and material quality per Lennox factory specifications, making it a reliable solution for restoring peak performance to your Lennox heating equipment.