A few years ago we purchased a couple of O2Cool 12v/battery fans and love them.
We were able to get the ones with the flip up handle, not like the fold down base units they have today.
We wanted to get them up off the limited counter top space we have so I decided to mount them to the ceiling.
I cut 2) five inch circles out of a 1/4 inch panel and cut 2) one inch PVC pipes at five inches. I cut down the length side of the PVC creating an opening of 7/8 inches. Then cut two holes through the side of the PVC for a tapered machine screw and access to that screw. I also have a nylon washer to go between the PVC and wood.
I painted the wood to almost (not) match the ceiling.
I assembled them like this. I had to cut part of one due to it butting up against a speaker.
I mounted them to the ceiling.
Now all I have to do is snap the handle into the slot and the fan is up off the counter. There gap in the PVC is just slightly smaller than the handle so it won't just fall out and to remove I just push the handle out of the gap.
I can swivel them in any direction and the fan also allows me to aim it up or down as well. This gives me complete control over where the air goes.