A chimney is an architectural ventilation structure made of masonry, clay or metal that isolates hot toxic exhaust gases or smoke produced by a boiler, stove, furnace, incinerator or fireplace from human living areas.

What is the difference between chimney and stack?

Explanation: The chimney is the whole thing, the stack is the part that sticks out (above the roof, usually).

What is meaning of chimney stack?

British. 1 : the part of a chimney that is above the roof of a building. 2 : a tall chimney on a factory, ship, etc., for carrying smoke away.