From the incomplete combustion of solidand liquidproducts,some unburnt particles are created which, on their way to the exit from the roof, are deposited on the chimney walls in the form of light fulgens (presenting themselvesin a dusty conformation) or, in the worstcase, originating hard crusts, more commonly identified as crystallized fulgens (tar).
Being such incrustations a magma of matter
not yet combating, the looming danger
it is given by the sudden ignition of these
sediments that could give rise to stresses
criticism of the building materials of the fireplace,
as well as triggering self-ignition to neighboring materials.
No less important is the appearance of dark spots on the surface of the external walls of theflue and the progressive reduction in the efficiency of the fireplace due to partial or total obstruction of the same.
The cleaning of the chimney hasthe purpose to avoid such inconveniences and to guarantee the safety of the tenant and of the structure in which he lives.