I had intended to use the around the house to move air throughout but ended up not using them at all. There are a few types, most of the fans are pretty good quality. If you want to give one, or all, a try they are yours for shipping costs. I may have matching power supplies as well I will include. Ask any questions and I will do my best to answer.
Those look to be about 4" x 4", and 24vdc, correct? How loud are they, can you hear them when running?
Yes on size and there may be others that aren't 24V but they are all DC. They are loud enough and move some serious air. Not all of them do, this is my add-on when I was experimenting with them. I have plenty of thumbwheels if you want one included, you do the wiring. Let me know!