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A Knox Box is a small, wall-mounted safe that holds building keys for fire departments, emergency medical services, and sometimes police to retrieve in emergency situations. [ 1 ] [ 2 ] The term "Knox-Box" is a brand name for such products produced by the American company Knox Associates, which does business as The Knox Company.
A taut wire perimeter security system is an independent screen of tensioned tripwires usually mounted on a fence or wall. Alternatively, the screen can be made thicker to avoid the need for a supporting chain-wire fence. These systems are designed to detect any physical attempt to penetrate the barrier.
The height of a rack can vary from a few inches, such as in a broadcast console, to a floor-mounted rack whose interior is 45 rack units (200.2 centimetres or 78.82 inches) high. 42U is a common configuration. Many wall-mounted enclosures for industrial equipment use 19-inch racks.
Physical security systems for protected facilities can be intended to: [2] [3] [4] deter potential intruders (e.g. warning signs, security lighting); detect intrusions, and identify, monitor and record intruders (e.g. security alarms, access control and CCTV systems);
All components of the vault, not just the walls and roof panels, must be Class 125 rated to achieve that overall rating for the vault. This includes the door assembly (a double door is needed since there is no single Class 125 vault door available), cable penetrations, coolant line penetrations (for split HVAC systems), and air duct penetrations.
A simple electromagnetic door holder consists of a strong electromagnet, usually attached to a wall or mounted in a floor pedestal enclosure, next to the door it controls. The mechanism may be mounted near the floor, at the upper corner of the open door, or at any convenient height along the latch edge (away from the hinged edge).