Well, playing with this voltage regulator, and all different styles sizes and types of fans. The common fan that is used in 1U equipment is the SanAce 40 fan they are 40x40x28 “mm” fans @ 12V.
Running it through the regulator at 6V-7V its pretty quiet and still moves a fair bit of air to keep the device cool.
So I ordered some resistors and 3 pin clips & cables to do more experimenting. stuff should be here in a week.
More ideas have evolved of this project, and in my head, its getting big 🙂 more ideas and more features.