Understanding of Steel Airtight Door
1. Steel Airtight Door adopts flat opening type. Divided by the number of doors, there are two types of air defense doors: single air defense door and double air defense door. Single-leaf doors are generally used for smaller-sized personnel entrances and exits. Double doors are generally used for larger vehicle entrances and exits.
2. Steel Airtight Door is divided according to whether there is a threshold at the entrance, and there are three types: fixed threshold, living threshold and door drop type.
①Fixed threshold series civil air defense doors have the advantages of reliable protection and low cost, but because there is a fixed threshold with a height of 150mm at the entrance, it is generally used for doorways where there are not many people coming in and out (such as the door of a poison chamber).
② The cost of the living threshold series civil air defense doors is slightly higher, and the threshold is installed in time of war, which can meet the corresponding protection and airtight requirements in wartime: there is no threshold at the door opening at ordinary times, which is convenient for the passage of personnel and vehicles, and also meets the requirements of fire evacuation. It is suitable for use in door openings where there are many people and vehicles entering and exiting.
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