Environmental Control. Conduct an analysis of the ambient
temperatures to determine HVAC requirements. Consider heating due to
electronic and electrical systems or fixtures, and security support equipment
inside the structure. Determine HVAC requirements based on NAVFAC HVAC
criteria for the local area. Insulate the walls, floor, and ceiling as
required by NAVFAC criteria for the local area. As a minimum, provide cold
water and soil lines if toilet facilities are required.
Lighting. Equip the tower cabin with interior lights furnished
with dimmer controls to aid with night vision and additional security to the
occupants. Provide a night light unit with a red lens and remote emergency
Equip the roof of the cabin with a moveable searchlight,
controllable from the interior of the cabin. The optimum recommended power
for the searchlight is 500 watts, at 35,000-candle power. Connect all
lighting to a standby power source, at the restricted area.
Grounding. Provide grounding and lightning protection. See
National Fire Protection Association (NFPA) 78, Lightning Protection Code.
Fortifications. When gun ports are required for tower cabins,
locations must be provided around the perimeter of the cabin. As a minimum,
they should be designed to ensure that the security fence and the entire clear
zone can be brought under fire. Other design considerations are the
compatibility of gun ports to type of weapons and attachments to be used
(i.e., night vision scopes).
Stairs and Ladders. Conduct an analysis of the anticipated threat
in the local area to determine if a requirement exists for providing a
ballistic-resistant enclosure for the stair or ladder used to access the tower
cabin. The stairs up the tower should have periodic landings to ease the
climb and facilitate maintenance of the inside of the tower. A rectangular
stair configuration is recommended as opposed to a circular one. A ship's
ladder and hatch will make the transition from the stairs through to the tower
cab possible. When a ballistic-resistant enclosure is provided for the stair
or ladder, an intrusion detection sensor and a remotely controlled access
system shall be installed on the ground level at the hardened access door.
Prefabricated Structures. State-of-the-art prefabricated guard
towers offer ballistic resistance that meets the requirements and standards
for threat levels I - IV. A prefabricated tower system consists of a cabin
with a roof, floor and sidewalls, access hatches, vision windows, and gun
ports. Where required, a hardened tower "tunnel" with circular or standard
riser stairway, hardened personnel access door, shrouded HVAC ports, and a
security lighting package may be ordered from manufacturers. The cabin and
tower are built with ballistic-resistant steel. All of the steel surfaces are
painted with rust inhibiting primer, and finish paint.
Conduct a thorough site analysis and review of operational requirements
for the area involved prior to initiating design of guard towers. Once the