The SJO0.8Z system is used as a metal insert made of acid-resistant steel sheet for flue gas discharge from high-temperature boilers for ecological solid fuels (wood).

The system has a maximum temperature resistance of 600 degrees C. It is made of 0.8 mm thick sheet metal, grade 1.4521. The elements of the system are connected to each other in a socket-like manner and there is no need to use gaskets. The advantage of using oval chimneys is the largest possible filling of the surface of the chimney shaft.