HP LH 3r - Manual (Page 6)

Chapter 1 Introduction
2
WARNING To prevent the rack from tipping over and causing equipment
damage or bodily injury, be sure that the stabilizing, anti-tip
feature is installed on this rack enclosure (see Figure 1-2).
WARNING To prevent the rack from tipping over and causing equipment
damage or bodily injury, do not extend more than one piece
of equipment at a time out of the front of the rack enclosure.
Be sure that the stabilizing, anti-tip feature is installed on the rack enclosure in
which you are installing the HP NetServer LH 3r. This option consists of two
"feet" at the front of the base of the enclosure and, if you are installing this
NetServer in a single rack enclosure, two "feet" each on the left and right sides of
the enclosure (see Figure 1-2).