Kaba's swing door drive unit designed for automating manual doors Swing door drive units take over the job of opening and closing manual interior doors as well as heavy and large-sized external doors. The opening motion is motorized whereas the closure is ensued through spring force or- if required e.g. due to strong wind pressure - via the motor. Individually selectable additional functions, contact-less motion detectors and safety sensors installed on the door leaf enhance the safety and convenience provided by manual swing doors.