Wiktionary
n. A technical term for the gaseous combustion product ("smoke") that comes out of a stove or a furnace.
Wikipedia
Flue gas is the gas exiting to the atmosphere via a flue, which is a pipe or channel for conveying exhaust gases from a fireplace, oven, furnace, boiler or steam generator. Quite often, the flue gas refers to the combustion exhaust gas produced at power plants. Its composition depends on what is being burned, but it will usually consist of mostly nitrogen (typically more than two-thirds) derived from the combustion of air, carbon dioxide , and water vapor as well as excess oxygen (also derived from the combustion air). It further contains a small percentage of a number of pollutants, such as particulate matter (like soot), carbon monoxide, nitrogen oxides, and sulfur oxides.
Usage examples of "flue gas".
When flue gas finally escapes, at points distant from the house,' it is so close to ambient temperature that only the most sensitive heat-seeker could sniff it.
When flue gas finally escapes, at points distant from the house, it is so close to ambient temperature that only the most sensitive heat-seeker could sniff it.