A flue pipe is a feature partisan to chimneys as it is constructed within a chimney using fireproof materials with the main purpose of carrying off combustible gases occurring within home heating installations like furnaces or fireplaces. Flue pipes get rid of these gases by emitting them to the atmosphere to limit or as a whole, prevent any indoor pollution from these gases that would otherwise be a health and fire hazard.
Made of metal, flue pipes are fire resistant and are sometimes, fortified with additional material to cement their insulating properties. The area in which one installs a flue pipe should also be insulated as a preventative measure.
Because flue pipes indiscriminately emit the said gases, they also do the same with the heat created by the heat source below. Heat exchangers install within a flue pipe to retrieve a percentage of the heat lost through the pipe. They are also referred to as heat barriers and are often located where the flue pipe goes through a wall, ceiling or the roof of the building in question.
They are made out of double-layered steel, which allows them a long life span, and although expensive, choosing the right heat exchangers is the difference between saving money spent on fuel. Thermostat-controlled fan driven heat exchangers are the most common type of heat exchangers out there.