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The vault door is set on a 100-hour time lock, and can only be opened by members of the depository staff who must dial separate combinations. Visitors are not allowed inside. It is so secure that the phrase "as safe as Fort Knox" has become a cliché for safety and security.
Blast doors were installed at personnel entrances. Personnel airlock of the Ouvrage "G" Security entrance at the gallery linking Ouvrage "G" to the rest of the fort. Six radar antennas and one microwave link to the Ballon de Servance were located on the fort's surface, with the electronic equipment in a room under each.
Newly arrested persons are usually driven in through a jail's sallyport and the exterior doors closed. Once inside the sallyport, arrestees are checked for weapons and officer weapons are stowed. Once all weapons are secured, the inner door is opened so that the prisoner and arresting officer may enter the jail.
The "Bala Hisar" gate is the main entrance to the fort located on the eastern side. It has a pointed arch bordered by rows of scroll work. The spandrels have yalis and decorated roundels. The area above the door has peacocks with ornate tails flanking an ornamental arched niche. The granite block lintel below has sculpted yalis flanking a disc.
Door locking hardware - Electrified locks, electric strikes, or maglocks physically secure doors and release when valid credentials are presented. Integration allows doors to unlock when authorized. Request to exit devices - These allow free egress through an access point without triggering an alarm.
Reinforced wood door. A typical exterior wooden door might be made out of two or more layers of oak planks. The grain of the wood would run vertically on the front layer and horizontally on the back, like a simple form of plywood. The two layers would be held together by iron studs, and the structure might be strengthened and stiffened with ...