My motor home has its first fan!

Today I went to the bus and installed one of my CPU fans. I tried it with a PP3 battery and it ran well.  My soldered joint then broke, which was annoying. The fan was pumping air quite well though I detected back flow around the edges. I'll put tape around the edges to cure that.

My next thing will be to run it one day off a PP3 battery to see how long it runs and how much difference it makes.