Excuse me, how to mount this fan? Or cut it out to make a sector? Thank you. I don't know anything about this.

There are many specifications of sectors, and there are many ways to mount them. For a slightly larger sector, two or three can be mounted in the form of a shaft, a banner, etc. For a slightly smaller sector, several can be mounted as album pages, etc. In the calligraphy and painting mounting shop, they can also give you appropriate suggestions according to the form of your work.