how to connect the fans to a raspbery 4

[RIKKO14]

what is the common sense to connect the fans to the case of my raspberry 4? the thumbnail of the fans should be up or down?

I also have the following diagram, is it preferable to connect the fans directly to the external power supply (5V, 5 A) in order to preserve the raspberry?

Thank you for your help.

[sdetweil]

@RIKKO14 all of mine are connected directly to the pi

[RIKKO14]

Ok thanks, I tested with a light, the thumbnail of the fans should be up for mine.

[sdetweil]

@RIKKO14 sorry what is thumbnail of fan?

[RIKKO14]

a priori, the editing on the 1st photo is good because air comes out, not with the editing of the 1st photo

[RIKKO14]

Thumbnail = the sticker on the fan

[aarish]

whenever I unplug my pi and plug it back in the fan will go crazy and make a loud noise. What I do is unplug it and plug it back in multiple times until it goes back to normal. Anyone know why?