Lenovo 6491 - Manual (Page 38)

Supported operating positions
Attention: Do not block the air vents on the top of the computer with any type of
objects such as a monitor.
To provide proper air flow to internal components, you must position your
computer in one of the positions as illustrated below.
Tools required
To install some options in your computer, you might need a flat-blade or Phillips
screwdriver. Additional tools might be needed for certain options. See the
instructions that come with the option.
Handling static-sensitive devices
Static electricity, although harmless to you, can seriously damage computer
components and options.
When you add an option, do not open the static-protective package containing the
option until you are instructed to do so.
When you handle options and other computer components, take these precautions
to avoid static electricity damage:
v Limit your movement. Movement can cause static electricity to build up around
you.
v Always handle components carefully. Handle adapters and memory modules by
the edges. Never touch any exposed circuitry.
v Prevent others from touching components.
18 User Guide