For high efficiency in spaces requiring limited space, the FSM compact unit type KSF-L meets the strictest demands. For air flow rates of 100 l/s or higher is what it is designed for . In fixed sizes, the plants are designed and the length of the tank of 1 m corresponds to a flow of 20 l/s. Fixed sizes is how the plants are designed and the corresponding tank length of 1m to a 20 l/s flow is suitable. The lamellas in different numbers cover the intermediate sizes. The entire tank length is extended through the outlet trough.