DG 1110-3-146
Design Guide: Military Police Facilities
December 1979
General Planning and Design Guidance: Environmental Service Sub-Systems
life-cycle economies and be used only where a rea-
sonable degree of change in the size, mission or
and summer cooling for the perimeter areas of the
function of operational and administrative support
building usually dictates the selection of either the
activities is probable or predictable. Such a system
fan-coil unit or the induction unit system. In the case
may be required in functional areas where a high
of induction units, ventilation air is furnished by in-
degree of flexibility is essential to operational effec-
dividual room units. In the case of fan-coil unit ventila-
tiveness. The basic requirements of acomprehensive
tion air may be furnished by room units (using open-
environmental services system are:
ings in the perimeter wall behind the units) or may
be supplied by a central air system, depending upon
(a) Each interior module should have an integrated
architectural considerations and the need for a cen-
lighting fixture and air outlet.
tral air system to supply air to interior areas. In order
(b) Each alternate outlet-fixture in both directions
to match the cooling capacity in air conditioning
in a checkerboard pattern should be a supply air
systems to physical need and functional require-
outlet and the other a return air outlet.
ments, the piping and the high-pressure ductwork for
(c) Each alternate perimeter module should have
induction unit systems must be multi-zoned and re-
a room unit.
lated to north-south exposure and heat gains, i.e.,
(d) Each perimeter module should have an inte-
all units on the north side of a building are served
grated light fixture and air outlet for ventilation air
by the same piping and duct system; all units on the
purposes, with supply air units alternating with return
south side are served by another piping and duct sys-
air units.
tem, and so on. When space requirements are not
(e) Each perimeter room unit should have automatic
extensive, the north and east systems, and the south
temperature controls, while the ductwork to the air
and west systems may be combined in the interest of
outlets should be zoned.
economy.
(f) Perimeter and interior modules should be placed
in a permanent space-divider grid to insure compati-
(2) Interior System For interior space, where cool-
bility of space organization.
ing is required year round regardless of the weather,
an all-air system is usually preferred. The selection
(2) Less Flexible Where a lesser degree of flexi-
of the type of system depends upon the size of the
bility is required, the interior HVAC module may be
system, the number of zones required, noise con-
increased in size to five or six feet square, or to
siderations and the permanence of these zones. For
four feet wide by eight feet long.
a small facility requiring multiple zones of operation,
(a) The air outlets need not be integrated with the
a multi-zone air system may be appropriate. For
lighting fixtures, or the module with the partition sys-
larger buildings with additional zones, the high-pres-
tem, but a separate air outlet could be provided
sure single-duct system may be more suitable. Dual-
connected to the ductwork by small flexible ducts.
duct systems have specialized properties that pro-
(b) Air outlets should be provided only to meet the
vide Increased safety and fire protectron; the largest
requirements of the initial space organization con-
military police facilities may require such additional
cept, partition layout, open operational activities or
provisions.
clustered administrative support.
(c) Blanked-off connections (or stubs) should be
h. DESIGNING FOR FLEXIBILITY Where a change
provided at the main ducts for future relocation of
in environmental services requirements or expansion of
the air outlets.
a facility is probable, some means of adapting to
(d) At the perimeter, a room unit should be provided
changes in the size and location of functional activity
every eight feet as before, however, ventilation air
areas, without requiring major changes in the environ-
would be supplied through separate air outlets using
mental services system, is desirable. Modules used for
small flexible ducts.
space planning are often too small to be used as HVAC
(e) Even this degree of flexibility Increases the cost
planning modules, although electrical and plumbing
of environmental services and should be limited to
modules usually coincide. Therefore, a multiple of the
those areas where functional or operational require-
space-planning module is typically used. Thus, for fa-
ments can be definitely established by the using
cilities that adopt a space-planning module of two feet
service.
and require air outlets with low noise and no art-drafts,
an interior HVAC module four feet wide by ten to four-
i. MECHANICAL EQUIPMENT The mechanical
teen feet long would be required
equipment required by HVAC systems should always be
(1) Most Flexible A comprehensive approach is
located as close as possible or central to the primary
required in selecting the environmental services for
areas it serves, but on the exterior of the facility, in a
a functionally integrated facility. While the example
locked and secure space accessible from a main cor-
requirements listed below provide good modular
ridor. For large buildings, it may be more economical
flexibility, the very high initial installed cost dictates
to have more than one mechanical equipment room.
that such a system be carefully evaluated in terms of
Roof-top mechanical equipment rooms do not require
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