740
Example Service Module: General Characteristics
The beams are prestressed, cast-in-place at 5'7-1/2" centers and are
continuous over the girders. The service bay is constructed of solid
concrete shear walls as part of the building's seismic bracing.
2. The ceiling subsystem is a poured gypsum deck supported on truss
tees and I-beam strongbacks, the latter at 8'0" centers supported from
the beams by hanger rods.
3. The partitions are gypsum board on metal studs and extend from the
floor to the underside of ceiling. The radiology room partitions have
lead backing and stronger metal studs to take the loading of the lead
and wall-hung equipment.
4. The HVC mechanical room has set at least one wall which is exterior to
allow a louvred opening for the fan unit as a direct air inlet, and also to
permit external access when a fan unit needs replacement.
741.3
SERVICES
Figure 740-2 illustrates the layout of the equipment in the service bay and
the main distribution of services in the service zone.
741.3.1
Service Bay
The service bay is laid out with the following assumptions:
1. The mechanical room could accommodate a 24,000 cfm supply fan unit
and a 20,000 cfm exhaust/return fan, based on an assumed maximum
service module requirement of 2.4 cfm/square foot. The items of
equipment shown are an 11,000 to 18,000 cfm supply fan unit and an
exhaust fan rated at 8,000 to 13,000 cfm, based on the functions in this
module requiring approximately 1.5 cfm/square foot. The excess
exhaust will be extracted by the toilet or special exhaust systems with
their fans located at the roof level.
2. The general exhaust shaft has an area of 130 square feet and can
handle about 100,000 cfm for the nine stacked service modules. The
toilet exhaust shaft at twelve square feet will handle about 10,000 cfm.
The special exhaust shaft could accommodate the equivalent of two
ducted exhausts of 36" diameter for laboratory fume hoods, etc.
3 - 138
Previous Page
