[SOLVED] Why does the Be Quiet Dark Rock Pro 4 come with 4 bracets?

[LAPIII]

vid

theere

 

[rgd1101]

for the fan to the cooler. it is in the video

 

[LAPIII]

I only need two since the front fan is already connected as you can see in this vid.

 

[rgd1101]

you could buy another fan and do triple fan
then keep it for back up