hinges with self-engaging [1-inch (25-mm)] lock pins should be used with one
or more high-security locks and dead bolts. Locks may be surface-mounted on
the inside of the door or mortised into and around a cutout in the armor
plate. Multiple and different locks and dead bolts should be considered.
Grouting or overlapping steel plates also should be specified for the frame-
Alternatively, for the high level of protection, provide bullet-
resistant walls a short distance in front of the door, extending several feet
to either side as shown in Figure 64. Use the same wall construction as
required for the building exterior.
4) Windows. Minimize the number of windows and the window areas
to limit available targets. Windows for the low level of protection depend
on concealment to protect assets. For the medium and high levels of
protection, provide bullet-resistant window assemblies to protect assets.
a) Low level of threat protection. Provide narrow windows
oriented obliquely to the exterior surfaces of the facility as illustrated in
Figure 65. Oblique windows limit the line-of-sight into the facility and
decrease the window target areas. In the design and in practice arrange
furniture and assets within the facility so that no occupants or assets
within the facility are within the direct line-of-sight through windows.
Provide reflective 0.004-inch (0.1-mm) fragment-retention film on window
glass to obscure the interior of the facility from outside visibility during
daylight. The film also limits the spread of glass fragments throughout a
room if a bullet shatters the window. Provide drapes, shades, or blinds to
obscure vision through the windows at night when the film is ineffective. As
an alternative to the oblique windows, place all window openings at least 6
feet (1.8 m) above the floor to limit an attacker's ability to see activity
below the sightline. Elevated windows also remove the constraints on
furniture or asset locations. Provide transparent fragment-retention film on
the elevated windows to minimize fragments entering the protected space.