The chimneys are made of acid-resistant chrome-nickel steel  of grade 1.4404 according to DIN 17441 with a thickness of 0.5 to 0.6 mm. They are mainly used for the discharging of fumes from gas, oil, wood or pellet-fired heating devices operating under negative pressure.  The outer wall is made of steel 1.4301-4N  brushed or painted black in RAL9005. Thermal insulation is made of 30 mm thick mineral wool.  Such chimneys are resistant to the corrosive effect of acidic condensate, formed during the combustion process. Water vapor condenses on the cool inner walls of the chimney and, in the form of condensate, is  through the bowl at the bottom of the chimney. The condensation phenomenon can occur at the time of starting or cyclical operation of the boiler.

Maximum temperature of continuous operation: 600°

Advantages:

– high resistance to acids, mainly sulfuric acid
– much lower flue gases flow resistance than traditional masonry chimneys due to lower surface roughness
– can be used indoors in newly built chimneys as well as when renovating old ones
– lightweight construction
– very simple and quick installation without demolition work
– possibility of any configuration of the set

Application:

– for the construction of stand-alone, free-standing chimney ducts for the discharge of fumes from stoves and heating appliances fired by gas, fuel oil, wood or pellets operating under negative pressure