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The Lennox 49K22 (49K2201) is a genuine OEM 1.25mm precision orifice that meters gas flow at an exact diameter to maintain the correct fuel-to-air ratio for safe and efficient combustion in Lennox heating systems. Signs of a failing or clogged orifice include weak or unstable flame, incomplete combustion, sooting, or a noticeable drop in heating performance. As a direct OEM replacement, this part guarantees an exact fit and dependable operation in compatible Lennox furnace and heating applications.