Balanced Flue Gas Fires & Stoves - A Balanced flue gas fire or stove appliance are completely sealed from the room into which it is installed (so there are no draughts and heating efficiency is increased) and a twin-wall pipe vents directly to an outside wall or out through a roof. The balanced flue twin-wall pipe works by drawing in air for combustion through the outer pipe whilst removing the combustion gases out through the inner pipe. Depending on the fire selection, the balanced flue pipe may exit horizontally through an external wall or vertically through the roof.