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C120-H007-05EN 19
2.3 Computer Room Structure
(2) Strength and surface material of free-access floor panels
Table 2.3 lists the strengths and surface materials suggested for free-access floor
panels.
(3) Opening for server-system-use
That area of the free-access floor in which a server system is installed requires a floor
panel opening, an auxiliary support and a slit floor panel.
When Fujitsu receives a free-access floor allocation plan from the user after the
finalization of an equipment layout, it will furnish an opening diagram marked with
an opening pattern, an auxiliary support position, and a slit floor panel position.
The user then proceeds with construction of the floor panel opening, an auxiliary
support, and slit floor panel on the basis of this opening diagram.
a) Floor panel opening
That area of the free-access floor in which an equipment is installed must have an
opening in the floor panel to facilitate equipment cabling and underfloor cold
ventilation.
b) Auxiliary supports
Depending on the shape of the floor panel opening, an auxiliary support may be
required to augment panel strength and to secure the panel in a firm position. In
installing equipment, such as a magnetic tape unit, on a floor panel, an auxiliary
support should be used to reinforce the floor panel so that the equipment can be kept
level by offsetting panel deflection.
c) Slit floor panels
Depending on the heat dissipation and the air intake/exhaust structures of the
equipment installed, a slit floor panel for cold ventilation may have to be installed in
the service area.
Table 2.3 Strengths and surface materials of free-access floor panels
Item Condition
Floor-panel strength Deflection not exceeding 1.5 mm (0.05 in.) under a
concentrated load of 4.9 kN (1100 lbf)
Surface
material
Suppression of
static electricity
Volume resistivity falling 10
6
to 10
9
Ω
Oil resistance and
ease of cleaning
Resistant to oils used during maintenance and easy to clean
Dust buildup
characteristics
Resistant to dust buildup