The SDB double-wall system is used to discharge flue gas from atmospheric boilers with an open combustion chamber. Chimneys are designed to work in dry conditions and have a maximum temperature resistance of 450 degrees C. These systems are used to discharge flue gas from gas and oil boilers.
These chimneys are made of 0.5-0.6 mm thick steel, grade 1.4521. The outer jacket is made of stainless steel grade 1.4509. Socket connections guarantee tightness of the system without the need to use gaskets. The system is insulated with 25 mm thick low-temperature thermal insulation wool.