A door including a main frame, a wing and a sealing apparatus which is interposed between main frame and wing when the door is in the closed condition. The sealing apparatus including a gasket extending along the main frame and a movable sealing member supported by the main frame, and exerting a compressive force on the gasket against the wing when the door is in the closed condition. An operating device moves the movable sealing member between an activated position, in which the movable member exerts the compressive force on the gasket, and a disabled condition, in which the movable member removes the compressive force from the gasket. The movable sealing member comprises a sealing counter-frame which extends along the whole perimeter of the main frame and is movable with respect to the wing when the door is in the closed condition, in a direction perpendicular to the door.