The SKKB (air-flue gas) system is used to discharge flue gas from condensing boilers operating in overpressure. Chimneys are designed to work in a wet environment. We make them of 0.5-0.6 mm thick steel, grade 1.4521. They show a maximum temperature resistance of 200 degrees C.

The system uses seals with possible temperature resistances of 120 degrees C and 200 degrees C. Chimneys are also very resistant to condensate.