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The Lennox 18K13 (105827-06) is an authentic OEM 14-orifice gas manifold engineered for accurate and balanced fuel distribution across the burner assembly in compatible Lennox heating systems. Signs of a failing gas manifold include inconsistent burner flames, delayed ignition, reduced heating efficiency, or detectable gas odor near the unit. This genuine Lennox part is a direct drop-in replacement, restoring safe and optimal furnace operation.