I made a short video of the ventbt operation.

This short video demonstates:

• Ventbot powering up and going through its autodetection sequence.
• Turning on the fans in the default ramp-up sequence.
• Turning off the fans in the default ramp-down sequence.

(These were all triggered by me pressing test mode buttons and not by the temperature sensor. I suggest you turn off the audio to avoid the annoyance of background footsteps, paper rustling, clocks ticking, etc.)