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C120-H007-05EN 23
2.3 Computer Room Structure
(2) Prevention of entry of outside air
Outside air penetrating through gaps in a window could threaten successful
temperature and humidity control of the air conditioning facilities.
Moreover, outside air might contain dust and harmful gases. From this standpoint, the
windows in the computer room should be made airtight or semi-airtight. Openings
that may allow the direct inflow of air from outside, from the floor right above or
below, from passages, and elsewhere should be sealed. Outside air that is taken in
must have its temperature and humidity regulated by an air conditioner before it can
be fed into the computer room.
(3) Shielding from direct sunlight
When direct sunlight enters the room through a window, it could produce local
temperature increases in the room or in the equipment, adversely affecting the
performance of such equipment. These windows must have blinds affixed to shield
the room from direct sunlight.
(4) Sound absorption and insulation
Appropriate sound absorption is recommended in the computer room to ease operator
fatigue that may be caused by various kinds of noises generated in the room. Among
all areas of the computer room, the ceiling and walls will make for the most effective
sound absorbers when modified to this end. The use of noncombustible sound
absorbers is recommended. The walls of the computer room should have a sound
insulation structure to prevent noise from traveling imparted to adjoining offices,
meeting rooms, etc.
If the floor is to be covered with carpeting as a sound absorber, such carpeting must be
free of static electricity and dust.
(5) Lighting
It is recommended that the computer room be illuminated to provide an illuminance
of 400 to 600 lx at a point 85 cm (33 in.) above the floor for server system operation
and maintenance purposes. Each lighting fixture should be furnished with a switch to
turn off the light when it is not necessary.