Arri Alexa Mini Fan Settings
Seeing how loud the fan is in the status section of the home screen:
The above section is located at point (14) on the image below:
Fan mode: Adapts the camera cooling to several shooting situations.
MENU > System > Fan mode
Regular: Creates a balance between fan noise and camera temperature.
Rec low: Increases fan speed during standby to pre-cool the camera. Minimizes fan speed/noise during recording.
Note: Ideal in an environment warmer than 25 °C (77 °F).
Low Noise: Minimises fan noise during both standby and recording.
Note: With data rates above 100 MB/s (due to fps/codec setting), the fan speed automatically increases to prevent CFast 2.0 cards from overheating.