Home Improvement Questions? Ask a Handyman for Answers
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The problem with your theory is that the only way the exhaust could get into the ductwork and into the house is if there was a crack in the heat exchanger in the furnace. This would not go away. Also a gas fired furnace has nothing even repmotely resembling a carburetor. Also carbon monoxide would be the most likely harmful exhaust product and it is odorless.