Smoke ducts are a vital component of any ventilation system. They help to remove smoke and other harmful gases from the surrounding environment. Some of the common synonyms for smoke ducts include chimney, flue, exhaust duct, and ventilation shaft. Chimney refers to a vertical duct that allows smoke to escape from a fireplace or stove. On the other hand, flue refers to a pipe or duct that is used to remove smoke from a furnace or other heating appliance. Exhaust duct and ventilation shaft are broader terms that include any type of duct through which air is circulated to remove pollutants like smoke, fumes, and other harmful gases.