A twin-wall insulated system used as a standalone external chimney for open combustion chamber boilers and fireplaces. It allows the heating unit (stove, fireplace) to be placed anywhere in the facility, as the chimney is installed on the outside and mounted on the wall. It is available in two versions: Premium – for gas, oil, wood, pellets and Standard – for gas and oil boilers. The system can operate only in dry conditions, at a temperature of up to 600°C