Stupid experiments with fans

For a long time I've been troubled by questions for which I couldn't find a clear answers. For example, what if you set all the fans to intake? And what if to exhaust? How much cooler will the GPU become if you remove the PCIe slot covers on the case? Can you help the computer if you cool it with a floor fan?
Today, I'll share my results from stupid tests. Perhaps, this will help someone make their gaming PC a bit cooler.

Gear from the video:
Pure Wings 3 Fans:
120mm - https://amzn.to/4f58e3q
140mm - https://amzn.to/4iszziO

Silent wings 4 fan on the CPU cooler - https://amzn.to/4iF7RQe
CPU Cooler - https://amzn.to/3OPbu8i
Case - https://amzn.to/3ZKTguU

Video light - https://amzn.to/41rZ4e5
Microphone - https://amzn.to/3BkfGKi