Asus 5U Tower Chassis Kit AK35 - Manual (Page 34)

Chapter 2: Hardware setup 2-18
2.6.2 Installing a long expansion card
If you are installing a long expansion card, such as some types of RAID
cards, use the plastic card support located near the front of the chassis
(under the backplane board) to keep the expansion cards firmly seated on
the slots. This card support has individual card guides that correspond to
each expansion slot.
To install a long expansion card:
1. Position the expansion card above the PCI slot that you wish to use.
2. Insert one end of the card to the card guide opposite the PCI slot, and
align the bracket end of the card to the expansion slot on the rear
panel.
3. Slide in the card down until it is properly seated on the slot.
4. Secure the card using the screwless lock on the card guide.
Plastic long-card support
Screwless lock