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Blast tube deterioration and CO
I thought that, normally, carbon monoxide is generated by lack of combustion air or flaky fire-side heat exchange surfaces. After correcting both in a Weil McLain model 578 low pressure steam boiler, CO remained over 2,000 PPM. So I pulled the burner to find that part of the end of the blast tube had been burned away. What would have caused this? Could the condition of the end of the blast tube cause high CO?