Air tight door

An air tight door comprising:

• 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 on the first longitudinal member along both lateral sides and the upper side of the opening, 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 disposed at each of a front surface and a rear surface of the door so as to unlock the locking device,
• wherein the first longitudinal member is provided with an insertion groove where the first sealing is seated,
• wherein the first sealing includes a fixed body that is fixed inside the insertion groove, and an elastic tube that is located inside the insertion groove and extends from the fixed body to closely contact the door in the state where the door has closed the opening, and
• wherein first and second sides of the elastic tube are each provided with a guiding bar that extends in a direction parallel with first and second side walls facing the insertion groove so as to inhibit the elastic tube from being constricted and stuck to the inside of the insertion groove.