Severe cold district tunnel construction defend cold keep warm automatic ventilation door

The utility model provides a severe cold district tunnel construction defend cold keep warm automatic ventilation door. The utility model relates to a severe cold district tunnel construction defend cold keep warm automatic ventilation door. The air door body include the arc baffle, the lower bottom surface fixed connection upper ledge baffle of last arc baffle, the left and right sides of upper ledge baffle opened the fan through -hole respectively, the fan through -hole between open and to have the window I of regulation, the lower bottom surface of upper ledge baffle connect composite door, composite door include left baffle and right baffle, the right side of left baffle pass through hinge connection left side fan door, the left side of right baffle pass through hinge connection right wing door, the top of left side fan door open and have the left side to adjust the window, the top of right wing door open and to have the right side to adjust the window, the below of right wing door open and to have pedest