A ventilator device configured for non-invasive ventilation of a person, comprising - a radial blower having an inlet opening and an outlet opening, wherein the radial blower is configured to receive ventilation air at the inlet opening and to provide the ventilation air with an adjustable ventilation pressure at the outlet opening, - a first ventilation duct having a first end, connected to the inlet opening of the radial blower, and having a second end, arranged to receive inhalation air, - a second ventilation duct having a first end, connected to the outlet opening of the radial blower, and having a second end, configured for coupling to a breathing mask, wherein the second ventilation duct is equipped with a sensor device, by which at least one flow parameter in the second ventilation duct can be measured, and - a control device configured to control the radial blower as a function of at least one output signal from the sensor device, wherein - the radial blower and the second ventilation duct form a continuous bidirectional flow path, wherein the adjustable ventilation pressure at the outlet opening of the radial blower comprises an inhalation pressure or an exhalation pressure, equal to or less than the inhalation pressure, - the second ventilation duct is equipped with a filter device, arranged for air flow filtering, and - the control device is, for controlling the radial blower, configured with a first control loop, by which the ventilation pressure at the outlet opening of the radial blower can be adjusted, characterized in that - the control device is, for controlling the radial blower, configured with a second control loop, by which at least one of a frequency of inhalation phases, in which the inhalation pressure is formed at the outlet opening of the radial blower, and a duty cycle of the duration of the inhalation phases relative to the duration of exhalation phases in which the exhalation pressure is formed at the outlet opening of the radial blower, can be set, wherein an actual value of the second control loop is supplied by a flow sensor. - a radial blower having an inlet opening and an outlet opening, wherein the radial blower is configured to receive ventilation air at the inlet opening and to provide the ventilation air with an adjustable ventilation pressure at the outlet opening, - a first ventilation duct having a first end, connected to the inlet opening of the radial blower, and having a second end, arranged to receive inhalation air, - a second ventilation duct having a first end, connected to the outlet opening of the radial blower, and having a second end, configured for coupling to a breathing mask, wherein the second ventilation duct is equipped with a sensor device, by which at least one flow parameter in the second ventilation duct can be measured, and - a control device configured to control the radial blower as a function of at least one output signal from the sensor device, wherein - the radial blower and the second ventilation duct form a continuous bidirectional flow path, wherein the adjustable ventilation pressure at the outlet opening of the radial blower comprises an inhalation pressure or an exhalation pressure, equal to or less than the inhalation pressure, - the second ventilation duct is equipped with a filter device, arranged for air flow filtering, and - the control device is, for controlling the radial blower, configured with a first control loop, by which the ventilation pressure at the outlet opening of the radial blower can be adjusted, characterized in that - the control device is, for controlling the radial blower, configured with a second control loop, by which at least one of a frequency of inhalation phases, in which the inhalation pressure is formed at the outlet opening of the radial blower, and a duty cycle of the duration of the inhalation phases relative to the duration of exhalation phases in which the exhalation pressure is formed at the outlet opening of the radial blower, can be set, wherein an actual value of the second control loop is supplied by a flow sensor.