340
Heating-Ventilating-Cooling: Organization
The horizontal dimension required to accommodate these supply ducts
and their equipment will be the dominant factor influencing the spacing of
the ceiling hangers defining these subzones.
343.1.3
Plenum Barrier
In case of a fire section containing two service modules and where the
return or exhaust systems use the service zone as a plenum, a plenum
barrier must be constructed between the adjacent service zones. This will
allow the plenums on either side to be utilized independently.
343.2
SERVICE BAY
343.2.1
General
The service bay contains three groups of components of the HVC
subsystem. The first is the air-handling equipment and associated header
ducts. The second is the exhaust ducts and shafts. The third is the piping
risers including steam and condensate, heating hot water and return, and
chilled water and return. These will probably be grouped with risers for
the plumbing subsystem to the module. (See Figure 340-3.)
The size of spaces and the arrangement of components should be such
that the largest potential units are comfortably accommodated, and any
change to the equipment, such as from all-exhaust to a return air system,
can be as straightforward as possible. Also, the position of the
components should be convenient for the corresponding supply and
exhaust secondary subzones in the service zone. The header to the two
supply main ducts must be placed within the service bay. This will avoid
the constriction of service distribution that would occur if the crossover
were made in the service zone itself.
The mechanical room is the control center for the service module HVC
system.
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