Note the simplified fastening mechanism of 5.25” devices. It is similar to the ASUS Vento implementation:
The drive is fixed on one side only and moves about a little in the bay. The HDD cage has an exhaust fan that does double duty as a front intake fan.
It’s easy to remove it. Just release the screw and push the cage with the fan into the case. The rear part of the PCB with the HDD connectors is somewhat empty:
That’s normal, though. This system case is not meant for a server, after all. As for the ventilation factor, the air goes through the three square holes which seems to be insufficient. We guess it is due to the abundance of free room that there are four standard 3-pin fan connectors on that PCB.
They are redundant. You can’t install more fans into this system case than it has already. And even if you do, any modern mainboard will provide you with at least a couple of fan connectors.
There is a 120mm fan with rather good specs on the rear panel:
It has a normal connector rather than an adapter for a Molex plug, which makes it simpler to connect it and to wire the cables in the case.
You should begin to assemble your system in this case from the power supply. As we mentioned above, the PSU is to be mounted into the container located at the top of the case.
It is fastened to a special plate on the rear panel that is supposed to make the whole procedure easier. The plate is secured with one screw: