Fujitsu fi-4860C Operator's Manual page 19

Do not block the ventilation ports.
Do not block the ventilation ports. Blocking the ventilation ports generates
heat inside the scanner, which may result in fire or scanner failure.
Do not place heavy objects or stand on top of the scanner.
Do not place heavy objects on the scanner or use the scanner's top
surface for performing other work. Improper use may cause injuries.
Before moving the scanner, disconnect the power plug from the power
outlet.
Do not move the scanner with the power and interface cables connected
as this might damage the cables, causing fire, electric shock or injuries.
Before moving the scanner, be sure to disconnect the power plug from the
power outlet, and disconnect connector cables. Also, make sure that the
floor is free of obstructions.
Protect the scanner from static electricity.
Install the scanner away from strong magnetic fields and other sources of
interference. Also, protect the scanner from static electricity as this might
cause the scanner to malfunction.