Automatic control complication

The device for ventilation is formed for detecting and outputting at least one to be monitored during ventilation parameter and provided with an automatic control complication. The device is embodied for evaluating the at least one detected parameter and for outputting a variable in dependence on the result of the evaluation signal. Typically, this signal represents the ridge of the deviation of the parameter from the target value. A user of the device is thus not only mediates an actual value of the parameter, but additionally or alternatively, a deviation of the parameter from the target value.