220
The Service Module: Service Zone
These should be located towards the ends of the cross section to avoid
the obstruction of branch ducts and branch services.
The sequence of channels will be controlled by three factors:
1. The position of the source of supply in the service bay. The location of
mechanical room, electrical room and plumbing shaft will follow a
similar pattern in all service modules.
2. The constraints on openings through the shear wall. These can be
estimated on the basis of maximum service requirements for the
module, and the shear wall constraints as discussed under the
structural subsystem, Section 310.
3. The horizontal space required to connect from each main to the
service branches.
The horizontal dimension of the channels will be governed by the width of
the service module, the number of channels required and the distance
between ceiling hangers. These hangers will serve as the physical
reference points for the channels. They can be expected to support
approximately 45 - 50 square feet of ceiling each, and therefore, in the
case of beam spacing at 5'7-1/2" centers, would be about 8' to 9' on
center along the beams. The mains require about this range, for instance,
for a single-duct HVC supply main with its associated terminal-reheat coils
and ducting. (See Figure 220-7.)
It would be a useful extension of channeling to also divide subzones S2
and S4 into service rights-of-way. The greater diversity of runs in these
subzones would make specific rules more difficult, but a careful
organization of the branch runs would help preserve predictable areas for
future penetration of the floor slab and ceiling respectively. Rules defining
a maximum of one HVC branch duct per hanger spacing and carefully
considered stacking of plumbing and electrical branches would also give
predictable access for maintenance. Figure 220-6 suggests such a
branch channeling within subzones S2 and S4.
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