D-Link DES-1526 - Manual (Page 16)

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u Leave at least 10cm (4 in.) of space at the front and rear of the
Switch for ventilation.
u Install the Switch on a sturdy, level surface that can support
its weight, or in an EIA standard -size equipment rack. For
information on rack installation, see the next section, titled
Rack Mounting.
u When installing the Switch on a level surface, attach the
rubber feet to the bottom of each device. The rubber feet
cushion the Switch and protect the Switch case from
scratching.
Installing the Switch on a Desktop
When installing the Switch on a desktop or shelf, the rubber feet
included with the Switch should first be attached. Attach these
cushioning feet on the bottom at each corner of the device. Allow
enough ventilation space between the Switch and any other
objects in the vicinity.
Figure 1. Installed on a Desktop