This is a range of flue pipes specially designed for pellet stoves which require a very high pressure class (P1) as they have a fan in the combustion circuit. Such a class can only be achieved with the use of gaskets. These pipes have the same constructive characteristics as the1.2 mm pipes: laser-welding ensures these carbon steel pipes perfect welding. Subsequent internal/external vitreous enamel coating baked to 850°C provides exceptional resistance against corrosion by combustion condensate. Total thickness (steel plus enamel coating) is 1.2 mm. They are perfectly resistant even to extreme situations such as soot-fire (a fire that occurs inside the pipe) without being damaged or modified; obviously, if a soot-fire should occur, the gaskets must be checked for signs of deterioration andchanged if necessary.