UFC 4-010-01
8 October 2003
Including change 1, 22 January 2007
building except where interior pressure and airflow control would more efficiently
prevent the spread of airborne contaminants and/or ensure the safety of egress
pathways. Locate the switch (or switches) to be easily accessible by building
occupants. Providing such a capability will allow the facility manager or building
security manager to limit the distribution of airborne contaminants that may be
introduced into the building.
B-4.3.1
air, and exhaust openings with low leakage dampers that are automatically closed when
the emergency air distribution shutoff switch is activated. The low leakage dampers will
have maximum leakage rates of 3 cfm/square foot with a differential pressure of one
inch of water gage across the damper.
B-4.3.2
Critical Areas. Local air handing units serving critical areas where
cooling and/or heating must be maintained to prevent mission failure, loss of data or
unsafe conditions can continue to recirculate air, but outside air, relief air and exhaust
must be closed with low leakage isolation dampers.
B-4.4
Standard 19. Utility Distribution and Installation. Utility systems can
suffer significant damage when subjected to the shock of an explosion. Some of these
utilities may be critical for safely evacuating personnel from the building or their
destruction could cause damage that is disproportionate to other building damage
resulting from an explosion. To minimize the possibility of the above hazards, apply the
following measures:
B-4.4.1
Utility Routing. For all new inhabited buildings, route critical or fragile
utilities so that they are not on exterior walls or on walls shared with mail rooms. This
requirement is recommended, but not mandatory, for existing buildings.
B-4.4.2
Redundant Utilities. Where redundant utilities are required in
accordance with other requirements or criteria, ensure that the redundant utilities are
not collocated or do not run in the same chases. This minimizes the possibility that both
sets of utilities will be adversely affected by a single event.
B-4.4.3
Emergency Backup Systems. Where emergency backup systems are
required in accordance with other requirements or criteria, ensure that they are located
away from the system components for which they provide backup. This minimizes the
possibility that both the primary system and its backup will be adversely affected by a
single event.
Standard 20. Equipment Bracing. Mount all overhead utilities and other
B-4.5
fixtures weighing 14 kilograms (31 pounds) or more (excluding distributed systems such
as piping networks that collectively exceed that weight) to minimize the likelihood that
they will fall and injure building occupants. Design all equipment mountings to resist
forces of 0.5 times the equipment weight in any horizontal direction and 1.5 times the
equipment weight in the downward direction. This standard does not preclude the need
B-20
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