The shape of the chimney stack, its position on the roof, any obstacles or the vicinity to other constructions of different heights are very important in determining whether chimney flues “draw". In addition, the external weather conditions are also very important. Strong wind on an irregular chimney stack can make it difficult for smoke to come out of the chimney flue with damaging effects on the functioning of the heat generator and the persons’ health.

Knowing how important chimney stacks are, S.C.M. proposes two types: one traditional stack and one for bad weather. The traditional one is requested in those cases where appearance is more important than technical features. The ESSECOM bad weather chimney stack optimises the chimney’s draw in any weather conditions (wind, rain, etc.). The chimney stack defends against bad weather thanks to its particular technical solutions, geometry and size. It does not use means of mechanical suction (always difficult to maintain and use), the use of which is also prohibited by UNI 10683 standard, point 4.2.4.