UFC 4-171-05
1 January 2005
with change 25 October 2006
unoccupied temperature conditions. Use temperature controls with setback and time-of-
day provisions that allow building temperatures to drift during unoccupied hours. Provide
protective shields for sensors and thermostats in exposed areas. Apply DDC (direct
digital controls) to VAV (variable air volume) and other multiple zone systems used on
larger (over 10,000 sf or 1000 sq m) buildings. Provide an emergency HVAC shutoff
switch accessible to building occupants that will shut down air handling systems to limit
distribution of airborne contaminants.
3-8.4
Zoning and System Considerations: emphasize the occupancy profile for
various areas of the building when analyzing systems. Where possible, isolate part-time
occupancy areas from full-time occupancy areas to reduce energy consumption. Allow
unoccupied zones to drift to the unoccupied space temperature limits. Make provisions
to introduce mechanically conditioned ventilation air only during the occupied hours for
each zone. Ventilation requirements listed in individual space criteria are minimums.
Humidification systems are not required. Dedicated dehumidification systems are
required only in arms storage vaults. Base additional design decisions on the
recommendations stated in the latest editions of the American Society of Heating,
Refrigerating and Air Conditioning Engineers (ASHRAE) Handbooks.
3-8.5
Provide dedicated mechanical room space for floor-mounted equipment.
Access doors must be lockable. Include adequate space for the equipment, duct and
piping connections, removal and replacement access, and manufacturer s
recommended service clearances around each piece of equipment. Equipment may
share service access space to minimize mechanical room floor area. Isolate natural
draft fuel-fired equipment from air-handling equipment to prevent down drafting of flue
gasses. Ventilation air intakes and exhausts must be a minimum of 15 ft (5 m) apart.
Intakes must be 10 ft (3.05 m) above grade due to AT/FP requirements, and be on a
different building face from exhausts. Intakes must also be as far as possible from
cooling towers, plumbing vents and any other source of contamination, see Air Intake
Minimum Separation Distance Table in ASHRAE 62.1. Army Reserve policy is to
minimize roof penetrations and roof-mounted mechanical equipment for both practical
and aesthetic reasons. Fresh air intakes will be located to maintain this intent while
complying with antiterrorism requirements.
3-8.6
Consider providing screen walls for exterior mechanical or electrical
equipment, to screen them from view to improve the appearance of the facility. If screen
walls are provided, their design must comply with AT/FP standards. Recommend and
provide manufacturer equipment ventilation. Typical screen walls are 8 ft (2450 mm) tall,
of a solid material with a lockable gate, and the screened area normally has a rock
mulch or similar ground cover. It may be necessary to provide a screen top to the
enclosure for AT/FP purposes.
3-9
PLUMBInG
3-9.1
MDS/USAR Approved Materials and Systems
3-9.1.1
The plumbing materials are those typically used for commercial construction
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