There are six pre-installed Kolink Umbra ARGB fans in the Kolink Observatory HF Glass ARGB PC Case, in 120mm and 140mm models. There are three 140mm fans mounted on the front, while there are two 120mm fans mounted on the top and one fan on the rear side. These fans can be controlled either via the built-in RGB button on the I/O panel or by the 140mm main fan connected to your motherboard with a 5V 3-pin adapter.
Alternatively, the front panel can accommodate up to three 120mm fans, while the top panel can accommodate two 140mm fans. Additionally, there are mounts for two 120mm fans on the power supply unit cover, for direct cooling to that chamber.
For water cooling fans, you can instead place radiators on the front and rear panels. The front can support radiators up to 360mm and the rear panel can accommodate a 120mm model. Lastly, there is a 160mm clearance for CPU coolers.