At the rear top we stumble onto two exhaust fans (1x rear & 1x top) that are standard and their rotation speed is 1,200RPM (±10%) with 12V input. No PWM control as these are fixed fans. You'd require a fan controller to lower the RPM and thus noise levels. They are quite silent though.

Also back at the innards, located at the 5.25" drive bays (chassis is placed on it's side now btw) you can see brackets above the 3.5" drive bay. So the chassis has four external 5.25” bays. The bottom two bays come with two adaptors. One of them allows you to install 3.5” devices and the other one allows you to install both 3.5” and 2.5” devices -- quite handy with the ongoing trend in SSD storage.

We spot another fan at the upper drive bay. Here you are looking at the backside of the Hot-Swappable HDD Bays. One tip btw .. in order for a drive to be hot-swappable, you need to tag your SATA BIOS settings towards AHCI and install a proper driver for that within Windows. If you do not have that enabled/installed .. please turn off the PC before removing/inserting your HDD.

Here I have zoomed in a little at the backside of the drive bay. A PCB becomes visible, connect power to it and lead the SATA connectors to your motherboard. Also you'll find little switches here for HDD Fan RPM control (low/high performance) and FAN headers for the Drive bay fans.