There is an air vent system at the top of the screen (it also exists at the bottom of the monitor). It is a good solution because the KTC G42P5 uses an internal power supply. There's no radiator, which would be useful for this kind (OLED) of screen.
All the ports are in two banks on the left side of the monitor, so even if the screen is close to the wall, they remain easily accessible. The interface comprises one DisplayPort 1.4, which features DSC (Display Stream Compression), allowing support for the full 4K @138Hz and 10-bit color depth. There are also two HDMI 2.1 ports. They do not provide the full 48 GBit/s bandwidth but are limited to 24 Gbit/s. Thus, 10-bit 4:4:4 chroma subsampling only works via a PC using Display Stream Compression (DSC) lossless compression, whereas consoles only get to output 10-bit 4:2:0.
3 USB 3.0 ports are available. One is an upstream port, and two are downstream USB 3.0. There is also a Type-C 90 W PD 3.0 reverse power supply. The required cable length is a bit longer since the cables have to be routed around the side or downwards around the monitor first. There is also a headphone jack.
Optionally, a sheet metal cover is included to cover the ports.
Only the power connector is at the bottom right side of the monitor.