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Do not push any objects into the openings of your computer. Doing so can cau se
fire or electric shock by shorting out interior components.
Keep your computer away from radiators an d heat sources. A lso, do not block
cooling vents. Avoid placing loose papers underneath your computer, and do not
place your computer in a closed-in wall unit or on a bed, sofa, or rug.
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For comfort and efficiency, observe the following ergonomic guidelines when setting
up and using your computer system:
Position your system so that the monitor and keyboard are dire ctly in front of y ou
as you work. Special shelves are available (from Dell and other so urces) to help
you correctly position your keyboard.
Set the monitor at a comfortable viewing distance (usually 510 to 610 millimeters
[20 to 24 inches] from your eyes).
Make sure the monitor screen is at eye level or slightly lower when you ar e sitting
in front of the monitor.
Adjust the tilt of the monitor, its contrast and brightn ess settings, and the lighting
around you (such as overhead lights, desk lamps, and the curtains or blinds on
nearby windows) to minimize reflections and glare on the monitor screen.
Use a chair that provides good lower back support.
Keep your forearms horizontal with your wrists in a neutral, comfortable position
while using the keyboard or mouse.
Always leave space to re st your hands while u sing the keyboard or mouse.
Let your upper arms hang naturally at your sides.
Sit erect, with your feet resting on the floor and your thighs level.
When sitting, make sure the weight of your legs is on your feet and not on the
front of your chair seat. Adjust your chair’s height or use a footrest, if necessa ry,
to maintain proper posture.
Vary your work activities. Try to organize your work so that you do not have to
type for extended periods of time. When you stop t yping, try to do things that
use both hands.