Camper van ventilation without using window vents or cutting holes (first see comment by @drewcress)

Cheap, stealthy, no-build, campervan ventilation. Here I figure out how to run the minivan's own blower fan to bring in fresh air all night. The trick is getting it to work completely disconnected from the van to ensure the car battery isn't dead in the morning.

PWM square wave signal generator: https://amzn.to/3APeAG1
18V Ryobi adapter with 12V step-down converter: https://amzn.to/3ZaniIc
40V Ryobi adapter with 12V step-down converter: https://amzn.to/3YRrkUM
Oscilloscope: https://amzn.to/3Octn0v
Lever wire connectors: https://amzn.to/3OexLMD
Smoke machine: https://amzn.to/3ZdRbaR
Fog juice: https://amzn.to/48TDIIg
Anemometer: https://amzn.to/40QWaza
Multimeter: https://amzn.to/4fur8Sd
Maxxfan: https://amzn.to/4fTckMM

*Sadly, those are not affiliate links. My Amazon Associate application got rejected because I don't have enough subscribers.