Drop-Type Double-Leaf Airtight Door

Threshold-free design. Cover plates are laid in the threshold groove in peacetime to keep the floor flat for easy passage of personnel, vehicles and equipment. The door leaves can swing open and closed without dropping down, and can serve as access management doors.

Installed behind protective airtight doors at entrances and exits of peacetime-wartime combined civil air defense projects, including underground malls, hospitals, warehouses and underground parking garages.