The device is a warm air humidifier which can be mounted on devices of the respiration therapy series VECTOR et. It is intendet to humidify the therapy air flow with moisture to prevent the mucous membranes of the upper respiratory tract from becoming dry. The heater output can be adjusted in five levels thus allowing the device to be adjusted to the individual patient’s requirements. When turning off the therapy device or taking off the humidifier the device saves the heating level that was set last.