Epson AcuLaser C1900 Reference Manual page 266

The Duplex Unit adds 44 mm (1.7 in.) to the right side of the
printer.
In addition to space consideration, always heed the following
precautions when finding a place to locate the printer:
Place the printer where you can easily unplug the power cord.
Keep the entire computer and printer system away from
potential sources of interference, such as loudspeakers or the
base units of cordless telephones.
Avoid using an electrical outlet that is controlled by wall
switches or automatic timers. Accidental disruption of power
can erase valuable information in your computer's and
printer's memory.
Caution:
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Cleaning and Transporting the Printer
Leave adequate room around the printer to allow for sufficient
ventilation.
Avoid locations that are subject to direct sunlight, excessive
heat, moisture, or dust.
Avoid using outlets that other appliances are plugged into.
Use a grounded outlet that matches the printer's power plug.
Do not use an adapter plug.
Only use an outlet that meets the power requirements for this
printer.