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1. Anti-theft This is the basic function of the door. The door body can prevent smashing. Using general hand tools, it can't be opened within 15 minutes. The door lock can be drill-proof and has a certain technological content.
2, the fire door body is made of metal, in the fire, within a certain period of time, can prevent the spread of open flames and smoke, to prevent the spread of fire.
3, the anti-cold door has insulation material, install the three anti-door, you can no longer install the ordinary door.