Let's take a look at this Chinese roof vent fan and see if its any good. Key features include:

Manual & electric operation
Rain sensor
Brushless DC motor
Adjustable speed.

Product links:
Roof fan: https://amzn.to/3ga7sGh
Sika 522: https://amzn.to/3ocsXdV
Solder shrink connectors: https://amzn.to/33W5bMB
Blade fuses: https://amzn.to/3s9ITiy
2mm 12v cable: https://amzn.to/3GkTSL6

Full Van Build Series Playlist:
   • TW - Van Build Series