Antec NINE HUNDRED TWO V3 - Manual (Page 7)

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7. There is a 120 mm fan pre-installed into each cage. Connect
the 4-pin connector to the power supply.
Note: There is a middle fan bracket pre-installed on one of
the HDD cages. Remove it from the cage if you decide to
mount your hard drives into this cage.
2.6 External 3.5” Device Installation
1.
Remove both side panels per the instructions
in Setting Up.
2. Remove the drive bay cover from the drive bay
you wish to install an external 3.5” drive into.
3. Install your external 3.5” device into the adapter.
4. Slide the drive adapter/device assembly into the bay.
5. Screw the adapter to the drive cage.
6. Mount the faceplate and secure it with screws.
2.7 External 5.25” Device Installation
Note: The HDD cages each occupy three consecutive
drive bays, and will block installation of larger devices
such as optical drives, so please plan ahead before
installing your drives.
1. Remove both side panels per the instructions in
Setting Up.
2. Remove the screws fastening the appropriate metal
drive bay cover(s) to the sides of the case.
3. Remove the cover(s).
4. If necessary, please remove the HDD cage that is
pre-installed in the bay.
5. Slide the 5.25” device into the bay from the front of
the case.
6. Fasten the drive using the screws that came with your
drive.
7. Connect the appropriate power and interface connectors
from the power supply and motherboard to the device.
Make sure that you leave some slack in the connections
so that you can easily access the fan filters for cleaning.
8. Mount the other devices accordingly.