Abstract: A door including a leaf which is closable between an open position and a closed position. A guide rail arrangement directs the movement of the door leaf. A fastening arrangement fixes a rail element of the guide rail arrangement to a wall by a plurality of fastening elements, each of which can be fixed to the wall as well as to the rail element. The wall has an opening which can be closed with the aid of the door leaf. A pulling arrangement can be fixed to the door leaf as well as to a drive unit and/or a weight-balancing device. At least one protective element is assigned to the guide rail arrangement. The protective element can be fixed to the rail element and/or at least one of the fastening elements and is used for bridging an intermediate space between the rail element and the wall.