I wanted to add a fan to my camper van which can be mounted in or to the roof window (Mini Heki). I found a 200mm (PC) fan which runs very quiet on 12V. There are 4 parts (3a 3b) to hold the fan with 10x10mm aluminium tubes. I also mounted a switch to one of them.
5f is the flex part for the window rail. It can be squeezed to get them into the rail. The flex also dampens vibrations. The parts will also hold the fan if it is mounted above the rail and the net.
The parts are fixed by M3 bolts.
Part 5f printed with Innoflex