The door has a frame rotatable around a vertical hinge axis. The door support arm (4) is made out of two arm shank pressed profiles (8A,B) which have multiple chambers. The door rotational axes (D1,2) are perpendicular to that of the support arm. The arm has perpendicular cell walls (12) each defining one hollow chamber cross section to which are fastened load guide rails (16,18) to receiving the rotational force. The bent area of the door extends out of parallel to the rotational axis. The multiple chamber profiles are connected at the bend to a pressed hollow cellular corner profile (10). The connecting corner profile has a connecting web (14) in the symmetrical plane of the corner profile.