I have a multimedia tower that I want to improve the airflow in. I have multiple computer case fans that I want to use. The idea was that I would put 2 per shelf. One for pulling in cool air and one for pulling out hot air. I have 2 questions when it comes to this:
How do I convert the fans so that I do not need a PSU?
How can I make it so that I can turn the fans on and off with a switch?