The chimney is an important element of our houses, for discharges of toxic substances that burned in the burning. A fireplace can be a very romantic setting or a disaster. Like anything else it requires maintenance to burn correctly. Metal chimneys usually arrive on with the cap and freemasonry chimneys have to be added one particular specifically when the house owner finds it required. Basically, it is a vertical tube running between the fireplace and the chimney stack. As wind blows over the stack, it should create a suction which draws the harmful combustion gases from the heating appliance up the flue and out of the chimney. Most chimneys are built with a bend in them to prevent rain from falling straight down the flue and on to the fire. The three most popular styles of chimney are mid ridge, gable end and mono pitch. These are available in a range of sizes and roof pitches with a choice of corbel, capping and pot designs.