CHAPTER 2 Installation Sites
2.3.2
Free-access flooring
The construction of free-access floors is reviewed with respect to the following items:
Raised floor height
Strength and surface material of free-access floor panels
Opening for server-system-use
Installation of floor panels for a building air conditioner
Each item is described as follows:
(1) Raised floor height
Regarding the raised floor height of a free-access floor, the following factors require
consideration:
Availability of underfloor ventilation
Cabling height
Safeguards against earthquakes
Table 2.2
Room
ventilation
Underfloor
ventilation
18
lists suggested raised floor heights for free-access floors.
Table 2.2 Raised floor heights of free-access floors
Condition
Erected directly on the free-access floor
Optional earthquake-free legs that absorb the
energy of earthquakes installed to protect
against earthquakes
Clamped from under the free-access floor to
protect against earthquakes
Erected directly on the free-access floor
Optional earthquake-free legs that absorb the
energy of earthquakes installed to protect
against earthquakes
Clamped from under the free-access floor to
protect against earthquakes
Raised floor height
180 mm (7 in.) or higher
250 mm (10 in.) or higher
300 mm (12 in.) or higher
400 mm (16 in.) or higher
C120-H007-08EN