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Wall Material
Wall Thickness
Concrete Masonry (Grouted)  102 mm (4")*
102 mm (4")*
Reinf. Concrete (3000 psi)
63.5 mm (2.5")
Steel Plate (mild)
8 mm (5/16")
Steel Plate (armor)
6 mm (1/4")
*Nominal thickness (Reference TM5-853 Volume 2)
Table 4-3 Thickness of Common Materials for Medium Ballistic Threat Severity Level
Since mechanical equipment may not be capable of providing sufficient ballistic resistance,
the location of the equipment will be determined to minimize potential exposure to projectile
penetration, or ballistic resistant louvers or equipment will be provided. As an example, it
may be prudent to install the HVAC equipment on the roof of the gatehouse or sentry booth
to reduce penetrations in the walls. Provide roof ballistic protection only where there are
sightlines to the roof. Consideration of the corrosion resistance and maintenance requirements
of the guard facilities, especially pre-manufactured facilities, is important due to the perils of
shore side exposure commonly encountered at Navy installations and the high visibility of
these structures.
As discussed in Section 4.12.8, specular-reflecting, low transmission glass at a tilted angle can
be used in the windows to limit view into the guard facilities from the exterior. Any windows
provided in the auxiliary fighting positions shall not interfere with the capability to respond to
an attack. Therefore, any windows must be capable of being fully opened/removed quickly
or have a substantial gun port to enable unobstructed line of fire from the position. Without
these capabilities the auxiliary fighting positions should have no windows. If ballistic resistant
glazing is maintained for some portion or all of an opening, consideration shall be given to
the visibility through the glazing after it has been impacted during an attack. Some ballistic
resistant glazing materials provide better visibility characteristics after impact than others.
4.12.7 Environmental Control
Provide heating and cooling appropriate for personnel, the electronic and electrical systems
or fixtures, and the security support equipment (4). The HVAC requirements should be based
on existing NAVFAC design guidance and installation requirements. Protection from chemical
or biological agents used during an attack should be considered based on the anticipated
threats. However, due to the small size of the facility comprehensive protection is often
infeasible. In order to limit airborne contamination and maximize the time for security
personnel to shelter in place and respond to an attack, the design of the HVAC system will
include minimum measures such as those outlined in the DoD Minimum Antiterrorism Standards
for Buildings (UFC 4-010-01). Design features should include elevated air intakes, emergency
air distribution shutoff switch, and the use of gasketed doors and windows to minimize air
4.12.8 Interior Lighting
The interior lighting should be diffused lighting and should be provided with dimmer controls
to aid with night vision and reduce the ability of those outside the guard facility to see inside.
The interior lighting should be connected to the backup power source. As discussed in


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