The N5500 is fairly small compared to a PC. The sides have ventilation holes for the hard drive and system board. The front bay door is vented, as well.
The front panel buttons are easily accessible.
To open the door you push on it and it pops open. Each of the drive caddies have a key lock on them to prevent the drive from easily walking off. Down the left side of the drive bays are the activity LEDs, power button, front USB port, and reset button.
The bay door mesh is not easily removable, but has easy access to clean.
On the back of the unit we can see the rear exhaust fan, power supply, and rear I/O panel. The I/O panel has four USB2 Type A host ports, one USB2 Type B target port, RS232 port for connecting to UPS unit, and dual gigabit LAN ports.
The bottom has four rubber stick on feet, one in each corner.