subject: Industrial Process Furnace [print this page] At the top of an industrial furnace is the stack, a cylindrical structure that expels waste gas from the furnace. The stack is necessary to move hazardous gases away from personnel, but it also serves another purpose. Inside the stack is what is called a damper blade, a valve that regulates the amount of heat lost through the stack. It also keeps the pressure inside the furnace within a range that is safe for those working around it.
