Noctura fan installation

Sorry for the silly question, but which way is the fan to be installed?

On one of the sides there are two arrows which I assume means the direction the blades spin and the direction of airflow, but should this side of the fan be at the top?

Thank you in advance for replies.

Apologies if this has been answered before and if so, if a mod could point me to the post that would be greatly appreciated. Thanks.

Does the second image on the shop page help?

I think on the side that goes to the cooler is a label sticker. Also IIRC the arrow has to point towards the cooler.

It does. Thanks for your help.