MIL-HDBK-1191
c) Designs shall include features to minimize HVAC service
interruptions to Critical Care spaces, without the provision of redundant
air handling units or distribution systems. Provisions shall be such that
service interruption to any Critical Care space, as a result of failure of
an air handling unit component or its supporting electrical or controls
systems, shall be minimized. Such features may include the provision of
multiple, isolatable, heating and cooling coils, spare stock of replacement
motors, drive belts, and bearings in the immediate vicinity of the
equipment room, dual fan units, "manifolded" ductwork connections between
AHUs, or other measures providing for continuity or expeditious restoration
of service.
d) Air Handling Units, with associated controls, which serve
critical care spaces and patient bedrooms shall be connected to the
electrical emergency power system.
8.7.2
Sensitive Areas. These are spaces or areas in which equipment
or processes may require special environmental control, including
continuous (24 hours per day, year-round) air conditioning and individual
room temperature and/or humidity control. Economic or operational
considerations normally dictate provision of independent air conditioning
systems for Sensitive Areas, to enable continuation of air conditioning
when main building systems are shut down for repairs, or are operating in
night setback or economizer mode. Minimum outside air ventilation shall be
provided in normally occupied areas. For those sensitive spaces critical
to continued hospital function and which require continuous cooling to
remain in operation, appropriate backup or redundant features shall be
provided to assure continuity of air conditioning in the event of primary
air conditioning equipment failure. This may include the requirement for
connection of air conditioning equipment to the emergency power system.
8.7.3
Administrative Areas. Administrative areas may be served by
single duct reheat, multi-zone, VAV, or dual-duct systems, with perimeter
radiation when required or advantageous.
8.7.4
Outpatient Clinics. Outpatient clinics may be served by single
duct reheat, dual-duct, VAV, or multi-zone systems. Multi-zone systems may
only be employed if the following conditions are considered: 1) ease of
mechanical room duct egress, 2) no large disparity in zone size or load
profile, 3) little likelihood of space repartitioning or rearrangement, and
4) proximity of space served to the mechanical room.
8.7.5
Support Service Areas. Support service areas may be served by
single duct reheat, dual-duct, VAV, or multi-zone systems.
8.7.6
Patient Bedrooms. Normal-care Patient bedrooms may be served
by dual duct, multi-zone, VAV, or single duct reheat systems. All systems
utilized shall maintain minimum ventilation quantities under all conditions
of operation. Perimeter radiation systems (radiant panels) may be
considered in conjunction with these air systems. Fin-tube heating systems
shall not be used in patient bedrooms.
8.7.6.1
Patient Isolation Bedrooms. Isolation bedrooms shall be served
by airflow systems which maintain a constant differential between supply
and exhaust air flow rates to maintain the required relative pressurization
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