6. Lift and slide the chassis so that the holes on the chassis flanges touch the holes in the rack postswith cage nuts. Use the rack bar (item 1 in Figure 9) as a guide.First tighten the bottom thumb screw on each flange; then tighten the top thumb screw.Figure 9. Chassis Installed in a 4-Post RackNOTE: To allow for increased airflow, you can remove the rack bar from the front posts.Using Dell ReadyRails (Optional)Dell Networking offers the Dell ReadyRails rack mounting system as an option to ease the installation of aswitch in a 2-post or 4-post rack. You must order a ReadyRails kit as a separate item; it is not part of theC9010 base configuration.You can install ReadyRails using a tool-less method in a non-threaded-hole rack or a tooled method in athreaded-hole rack. Dell ReadyRails support a rack depth of 24 to 30 inches.WARNING: Due to the weight of a fully populated C9010 chassis, never install or pull a full chassisout of a rack with ReadyRails. First remove each component before you lift or remove the chassis.The ReadyRails kit consists of:• Chassis rails that fit on the left and right sides of a C9010 chassis (items 1 and 2 in Figure 10)• Left and right rail brackets that fit into the front rails on 2-post racks (items 3 and 4 in Figure 10)Installing the Hardware 17