A stirrer unit consists of several stirrers, coupler bearings and a chain drive as well as cooling equipment for drives and couplers. The elements are mounted as a complete unit in a steel support frame together with a small control panel to control the rotating direction and the speed of the stirrer. The stirrer types are engineered individually to achieve the best results in colour homogeneity.
Each individual stirrer unit can be winched upwards out of the glass separately in order to execute maintenance work (e.g. change of stirrers). In this case the stirrers hang right above the forehearth superstructure. Alternatively, the stirrer unit can be moved laterally to a platform beside the forehearth which facilitates maintenance procedures such as changing the stirrers.