Nortel Passport 15000 Hardware Installation And Maintenance page 515

• a hand holds the narrow rear end
• a hand holds the fan end
2 Facing the front of the rack, insert the narrow end of the cooling unit
between the adapter brackets fastened to the rack uprights.
3 Slide the cooling unit inwards until the mounting ears at the fan end touch
the adapter brackets as shown in the figure "Position and orientation of
the upper cooling unit NTHR52 in a 23-inch wide rack" (page 517).
4 Align the mounting-ear holes to the screw holes on the brackets.
5 While holding the unit in position, loosely fasten a thread-forming 10-mm
(3/8-in.) hex-head screw (P0601478) through an upper mounting-ear
hole. See the figure "The upper cooling unit, front and rear views"
(page 516).
6 Loosely fasten another screw through a lower mounting-ear hole on the
opposite side of the unit, then the remaining 2 screws.
7 Center the unit between the brackets and tighten all 4 screws to snug plus
a 1/4 turn.
Passport 15000, 20000 Hardware Installation, Maintenance, and Upgrade
Chapter 17 Hardware procedures 515
5.2S2