HP 2600fx Optical Disk Drive - Manual (Page 13)

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Preparing the Environment
The following environmental factors will help ensure top performance of your
optical disk drive.
Clearance Requirements
A minimum of 70-80 mm (3 in.) is required behind the rear panel and in front of
the optical disk drive for air circulation.
Location Requirements
Position the drive away from sources of particulate contamination such as
frequently-used doors and walkways, printers, stacks of supplies that collect
dust, and smoke-filled rooms.