Ventilation device for civil air defense project

The utility model discloses a ventilation device for civil air defense engineering, which comprises a ventilation pipe, the ventilation pipe is fixed through a pipeline support, a butt joint is arranged at the end part of the ventilation pipe, a fixed box is arranged on one side, far away from the ventilation pipe, of the butt joint, and the fixed box is a cavity box body with a rectangular structure; the fixed box is connected with the butt joint through the connecting joint; the utility model relates to the technical field of civil air defense ventilation devices, in particular to a ventilation device for civil air defense engineering, an integrated closed box body is in shaft connection with a plurality of secondary treatment boxes and an axial flow filter element, air treated by the axial flow filter element enters the secondary treatment boxes, the structures of the different secondary treatment boxes are improved, and the ventilation effect of the civil air defense engineering is improved. Different sec