Good quality bricks can also be made by firing the kiln with coal instead of firewood. If coal is available in your area, use it, since the use of firewood for brickmaking can lead to rapid deforestation.
The method of building the field kiln and firing the bricks using coal is quite different than that used with firewood. The number of bricks one can fire in a kiln of this type is from 10,000 to 100,000.
The following is a step-by step description for building a 20,000 brick field kiln (sometimes called a scove kiln) using coal as the fuel. The approximate length and width of the kiln is 4 metres. The overall height of the kiln is about 3.5 metres.