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122. You are observing the flame condition on an oil-fired auxiliary boiler through an observation window peephole. The flame is a reddish color accompanied by a noticeably panting/pulsating furnace. What would be the correlating color of the gases exhausting from the stack under these conditions?
A reddish, panting flame indicates incomplete combustion due to insufficient air or poor atomization, resulting in unburned carbon particles and dense black smoke exhaust.
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