Door arrangement fitted to a first enclosed space for reducing contamination risks when a second enclosed space is connected to the first enclosed space

A door arrangement of a first enclosed space allowing a sealed connection between said first enclosed space and a second enclosed space, comprising

• a first flange arranged to define a passage opening in the first enclosed space, the passage opening defining an opening plane and a passage axis perpendicular to the opening plane;
• a first door hingedly mounted on the first flange so as to pass between a closed position, in which the door closes the passage opening, and an open position;
• and
• securing means for securing and maintaining a second flange of the second enclosed space pressed against the flange of the first space;
• characterized in that the securing means comprise locking catches movable between an unlocked position in which they are recessed within the first flange and a locked position in which they project radially from the first flange toward the passage opening, thus locking the second flange of the second enclosed space without rotational movement of said flange by engaging each catch in a notch provided on an outer peripheral edge of the flange of the second space, when the first and second enclosed spaces are connected to each other.