HP 20-Feb manual Front Back, To allow enough clearance, illustrated in on

Figure 5 Clip Nut Placement (6/60 Series)

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Chapter 1

2.Align the upper (black) rail with the top two clip nuts and loosely install a screw into each clip nut. Slide the rail out so that it equals the rack depth, and attach to the back clip nuts. To allow for enough clearance, do not tighten these screws until you have installed the library.

Note	Ensure that you are using the appropriate holes in the upper rail
	to allow enough clearance, illustrated in Figure 6 on page 22.
	The clearance between the top and bottom rails should be
	approximately: 2/20 series = 22 cm (9 in); 4/40 series = 43 cm
	(17 in); 6/60 series = 65 cm (26 in).

Chapter 1 Installing the 2/20, 4/40 & 6/60 Series Libraries into a Rack 21