220
The Service Module: Size and Shape
222.2
RANGE OF SHAPES
222.2.1
Narrow Service Modules
Service modules narrower than about 50 feet are difficult to organize into
longitudinal service distribution zones with good accessibility. They also
produce a serious problem of coordination where the main distribution
lines penetrate the shear wall between the service bay and the rest of the
module. These difficulties are significant in a 10,000 square foot module,
which if 50 feet wide would be 200 feet long; they would be very serious in
a 15,000 square foot module, which at the same width would be 300 feet
long. It is therefore not advisable to constitute long service modules of
single span bays with less than the 49'6" span provided by the system.
222.2.2
Wide Service Modules
The greatest width of service module that can be generated by a double
span within the system is 117 feet.
Wider modules would require more than one interior girder. Since
modules of the 10,000 square foot optimum size would require two supply
trunk ducts, even with a single duct reheat system, it is a simple matter to
serve a doubt span module. A triple span, however, would require either
long branches, or an additional trunk duct.
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