Overview

Flue gas is the gas exiting the atmosphere via a flue, a pipe or channel for conveying exhaust gases, such as from a fireplace, oven, furnace, boiler or steam generator. It often refers to the exhaust gas of combustion

Combustion of fossil fuels is a common source of flue gas. They are usually combusted with ambient air, with the largest part of the flue gas from most fossil-fuel combustion being nitrogen, carbon dioxide, and water vapor.