boilers, cooling towers, pumps, AHUs, etc.) will be
The maximum percentage of recirculated air should not
designed using redundant equipment of various sizes to
satisfy the requirements of differing number and sizes of
If the courtroom is served by a fan system dedicated to
zones. (The goal is to service no more than two court-
more than one courtroom, then the return air from each
rooms per each air handling unit.) Piping systems should
courtroom and its associated areas must be ducted
consider arrangements to permit changing courtroom
directly to the unit.
HVAC systems from primary to secondary chilled water
Return air from the chamber suites will be ducted directly
for off hours. The design shall allow sub-metering of
toward the return air shaft for a minimum distance of
utilities and equipment to permit the facility manager to
fifteen (15) feet. (Treat ductwork to meet the acoustical
allocate cost of operation beyond standard-hours of
System Description and Control. Trial jury suites should
Temperature and Systems Control. The HVAC system
be served from the same system as the associated
serving judge's chambers, courtrooms, and trial jury suites
courtrooms. (A separate thermostat for each trial jury
should provide an average temperature of 23.4 (74F).
room is desirable.)
The courtroom system zone will be designed to allow
thermostats to be reset from the building automation
Air Distribution. Air distribution systems in the jury
system to pre-cool to 21.1C (70F) prior to scheduled
facilities must provide separate temperature control and
a high degree of acoustical isolation, particularly in the
grand jury and trial jury rooms. Return air from the
Air Distribution. The diffusers serving the spectator areas
rooms must be ducted directly back to the exhaust air
must be sized to serve the allowable seating capacity plus
riser. Ductwork will be treated to meet the acoustical
25%, to accommodate for extra seating. The diffusers
deliberation room design criteria.
need to be selected to meet minimum ventilation
requirements at no loads, with no appreciable increase in
Air Changes. In the Assembly Room, Deliberation Room,
system noise during load changes.
and toilet rooms, the system must provide 10 air changes
per hour (ACH) with 80-85% return.
Provide six (6) air changes per hour for rooms with
ceiling height up to 4.6 meters (15 feet); and eight (8) air
Refer to USMS-RSSPSSM for all detention requirements.
changes per hour for rooms with a ceiling height greater
than 4.6 meters (15 feet). Systems should be designed to
meet these requirements when spaces are fully occupied,
unless otherwise noted.
278 F A C I L I T I E S S T A N D A R D S
9.5 Mechanical Systems
Revised March 2005 PBS-P100