Chimney clutch S10
If there is too high draught in the boiler, inject additional air from the boiler room using a damper (chimney clutch) which is on the boiler chimney. In order to reduce the draught and vibration, a chimney hole should be opened. In order to increase the draught, close the hole with the chimney clutch. its is more convenient to clean through the smoke outlet (by dismantling the chimney connector), or through a special hole in the connection. When you buy the boiler, it will be included.