A chimney is an integral part of every heating device. Its task is to draw smoke and controllably lead it outside into the atmosphere. This is one of the most burdened components of a building, since throughout its lifetime it is exposed to high temperatures, weather conditions and condensation that is a side product of burning. For these reasons, it is important to provide the necessary stability, mechanical resistance and safety during use in the phase of planning and building. Suitable materials and proper construction of chimneys are determined by standards, regulations and laws which determine how to properly maintain them throughout their lifetime. This thesis discusses the quality assurance of smoke coils during their use. Due to poor maintenance and improper construction, there are more and more chimney fires every year, therefore, this is a highly topical subject. This thesis presents the most common faults of smoke coils, many of which occur as early as during their construction. They are exposed only later on with their regular use. Finally, the thesis also presents possible ways of restoring chimneys and a construction of a chimney, resistant to soot ignition.