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that carbon monoxide is only formed from incomplete combustion. almost everything that I have read online says that this is so. Even the name implies this. Monoxide, lacking the oxygen atom that would normaly be a bibroduct of combustion as carbon dioxide. But many people in the field for a long time insist that if you drill a hole in a furnace heat exchanger (excluding other problems this would create) you will for sure get CO in the house. Thanks, Michael.
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