220
The Service Module: Service Zone
S2
Branch Distribution: parallel to beams.
This subzone will contain the structural beams, pressure piping,
and the gravity drainage and vents for the service module above.
The calculated depths required for these components will govern
the design depth of the subzone.
S3
Main Distribution: parallel to girders.
This is the major subzone and is reserved for main distribution of
services through the length of the service zone. It is divided by
service into channels. The depth will be governed by the
requirements for HVC supply and return/exhaust ducts. (See
Section 344.2.)
S4
Branch Distribution: parallel to beams.
This subzone contains the HVC and electrical branches and vents,
with the HVC branches governing the design depth.
S5
Lateral Distribution: parallel to girders.
This subzone will take the final service run to its location over the
service drop into the functional zone. It will contain HVC flexible
duct and terminals, electrical conduit and junction boxes, and final
plumbing runs. Any projections from the ceiling construction, such
as I-beam strongbacks, will run parallel to the services at this level.
The HVC flexible duct and terminals will determine the design
depth for this subzone.
S6
Platform/Ceiling
This subzone equals the overall depth of the walk-on platform,
ceiling structure and finish.
224.2
CHANNELS
Channels are plan subdivisions of a subzone and define the rights-of-way
of particular services. At the S3 level, they provide reserved space for the
main distribution of services, both those originally required for the service
module and any predicted future need. Figure 220-8 shows a
representative set of channels in a service zone of two spans of 40'6".
Included are subzones designated for personnel access.
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