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The Service Module: Service Zone
224.3
ACCESS AND MAINTENANCE
As discussed above, channels reserved for personnel access will be
positioned near the edges of the service zone. They will be reached from
the service bay by doors through the shear wall. Similar doored openings
will allow passage where required to adjacent service zones through the
surrounding two-hour fire partitions and shear walls. Secondary access
through the ceiling could be provided where convenient.
The service zone must be designed to conform to code provisions for
industrial safety. This requirement is simplified by the fact that all major
equipment is restricted to the service bay. The service zone must be
suitably lit, ventilated and signposted.
It is assumed that maintenance routines will be primarily concerned with a
weekly HVC check, and for other services at longer intervals. But if
materials-handling systems are routed through the service zone, e.g.,
pneumatic tubes, tote box carriers, etc., more frequent access to these
systems may be necessary.
224.4
CONSTRUCTION DESIGN
As discussed above, the ceiling hanger spacing will define channels. The
direction of beams and strongbacks, and the depths of beams will visually
locate subzones. This would provide physical references in the service
zone both for the initial positioning of services and for later revisions to the
layout.
The installation of main distribution and branch ducts will need careful
coordination with the ceiling subsystem erection. But as soon as practical,
the ceiling should be installed to provide a working platform for the
completion of the service distribution.
Where two service zones exist within one fire section, a smoke stop
partition should be erected between them. This partition would also
provide a plenum barrier where both service zones are used as
exhaust/return plenums in the HVC subsystem.
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