Turning windows to open them is easy and effortless, but not all windows should be capable of being opened unrestricted. That's why SIEGENIA has developed two special restrictors, which limit the turn-opening of turning sashes and turn-and-tilt sashes to a maximum of 89 mm, without the need for additional release mechanisms on the window sash. With the comfort version, the restrictor can be decoupled quickly and easily if needed with a flick of the wrist. In addition, a version compliant with EN 13126-5 is also available for cases with special requirements in terms of child safety. This version now comes fitted with an anti-slam device, which prevents the sash from closing unintentionally when ventilating the room.