Flue

A chimney is a funnel-shaped cap over a free or open fire.

Function and nature

It serves to direct the flue gases that are quite harmful, at certain concentrations in the chimney. They are located mostly over open fires or on the forge in forging. Mostly made ​​of metal, very rarely also of stone, they protect persons in the corresponding space of a possible smoke inhalation because they suck expanded in terms of area, the gases from the fire and derive.