Abstract: The present disclosure relates to an air tight door including a frame having three frame members disposed, respectively, at a first lateral side, a second lateral side, and an upper side of an opening; and a longitudinal member disposed at a lower side of the opening. The door is rotatably connected to the frame member disposed at the first lateral side of the opening so as to open and/or close the opening. A first sealing disposed at each of the three frame members closely contacts the door in a closed state; and a second sealing elevatably disposed at a lower end of the door descends from the lower end of the door to closely contact the longitudinal member in the closed state. A locking device fixes a position of the door in the closed state; and an actuating device is configured to unlock the locking device.

Abstract: The present disclosure relates to an air tight door, and the air tight door according to the present disclosure is characterized to include a frame including a first longitudinal member disposed at each of both lateral sides and an upper side of an opening, and a second longitudinal member disposed at a lower side of the opening; a door that is rotatably connected to the first longitudinal member disposed at one side of the opening so as to open and/or close the opening; a first sealing that is disposed at each of the first longitudinal member of the frame, and that closely contacts the door in a state where the door has closed the opening; and a second sealing that is elevatably disposed at a lower end of the door, and that descends from the lower end of the door to closely contact an upper surface of the second longitudinal member in the state where the door has closed the opening; a locking device that fixes a position of the door in the state where the door has closed the opening; and an actuating device