HP rp7400, Hardware Manual

Page: 41 / 162

Specify Raised Floor Requirements
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In a raised floor environment, the power drops and interface cables from the equipment are routed down
through the panel pull section, through a grommet-protected opening (beneath the floor level), and under the
floor panels, as shown in the following illustration:
Air Plenum
In some data processing environments, the underflow area is used as an air plenum, with cool, controlled air
flowing under the raised floor and distributed to the heat loads out in the data processing area. Return air is
routed back to the tops of the process control HVAC units.
This can create some potential problems:
• Concrete sub-flooring should be sealed, but often is not. Concrete continues to ‘shed’ over its lifetime and
will add to humidity control problems.
• Improper cable routing can and does cause air flow distribution problems.
Cable routing
Most data processing environments use the space under the raised flooring to route data and power cables.
Since this is often not closely controlled, potential problems may arise such as: