I was making a grow room, needed a way to take in air from under the cabinet and bring it into the grow room, I needed quiet. So here's what I came up with. I used a pc fan and 2 shrouds, Open on the back for air intake and the other one on the top can point into the grow room. I used a 12 volt adapter and wired it to a second fan, so they both run at the same time and I have double the intake, I taped them together with Gorilla tape so they can come apart. I also included a small wire to hang the fans if I needed to intake air from the top of the shelf as well or turn the second over to vent the room...here's a picture of the fan in action View attachment 2514226 Easy to use and a fun recycled project.