Flue Stack

Flue Stack


The flue stack on the heater is very important for several reasons. In addition to just getting the flue gasses up and out of the way where they won't endanger people, they also perform other functions. In the example shown, draft or flow of the flue gas is controled by an induced draft fan. In a natural draft furnace, the draft created in the stack is what "pulls' the flue gasses through the furnace convection.